【多选题】
Which three actions can be taken as a result of executing the vSphere Update Manager 6.x scan and remediation wizards? (Choose three.)___
A. Install and upgrade software in virtual machines.
B. Upgrade the firmware on ESXi host devices.
C. Upgrade and Patch ESXi hosts.
D. Install and update third-party software on hosts.
E. Upgrade virtual machine hardware.
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答案
CDE
解析
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相关试题
【多选题】
Which two statements are true about deploying and using vSphere Replication? (Choose two.)___
A. ESXi hosts managed by a single vCenter Server instance require a connection between the two vSphere Replication appliances.
B. Sites managed by different vCenter Server instances require a connection between the two vSphere Replication appliances.
C. Sites managed by different vCenter Server instances require the use of Site Recovery Manager and a connection between the two vSphere Replication appliances.
D. ESXi hosts managed by a single vCenter Server instance require a single vSphere Replication appliance.
【多选题】
An administrator is attempting to power on a virtual machine, but the task is hanging at 95%. What three scenarios best explain why this problem is happening? (Choose three.)___
A. A virtual machine question is currently being posed to the administrator.
B. Another task for the virtual machine or other component is already in progress.
C. The VMware High Availability cluster has insufficient resources to guarantee failover.
D. The host has lost access to the storage device containing the virtual machine files.
E. The host is under resource contention and unable to power on the virtual machine.
【多选题】
Which three features are not supported when using Fault Tolerance in vSphere 6.x? (Choose three.)___
A. Virtual Volumes (VVOLS)
B. Storage vMotion
C. Virtual Machine Component Protection
D. vMotion
E. vSphere Distributed Switches
【多选题】
Which two storage controller configurations can be used with Virtual SAN? (Choose two.)___
A. SAS controllers in Passthrough mode
B. SAS controllers in RAID0 mode
C. SAS controllers in RAID1 mode
D. SAS controllers in RAID10 mode
【多选题】
Which three are requirements when using vMotion to move a virtual machine across vCenter Server systems? (Choose three.)___
A. Both vCenter Servers must be using Enhanced Linked Mode.
B. Both vCenter Servers must be in the same Single Sign-On Domain.
C. Time must be synchronized.
D. Duplicate VM MAC addresses must be configured.
E. Both vCenter Servers must have High Availability enabled on source and destination clusters.
【多选题】
Which two components can be used when configuring Enhanced Linked Mode? (Choose two.)___
A. vCenter Server Appliance
B. vRealize Operations Manager
C. vSphere Management Appliance
D. vCenter Server for Windows
【多选题】
An organization has a number of virtual machines that would benefit from Fault Tolerance. These include: <A single vCPU Apache Server> < A dual vCPU vCenter Server> < A quad vCPU SQL Server> <An eight vCPU Hadoop Server>. Which two virtual machines can be configured to use VMware Fault Tolerance? (Choose two.)___
A. Apache Server
B. vCenter Server
C. SQL Server
D. Hadoop Server
【多选题】
Which two badges are major badges in vRealize Operations? (Choose two.)___
A. Risk
B. Efficency
C. Workload
D. Faults
【多选题】
An administrator is deploying multiple Windows 2003 Virtual Machines from the same template. What two steps should be taken to avoid network conflicts? (Choose two.)___
A. Customize the guest operating system.
B. Install VMware Tools into the new virtual machines.
C. Copy the Microsoft Sysprep tools onto the vCenter Server system.
D. Ensure the e1000 vmnic is selected for each new virtual machine.
【多选题】
Which three conditions would prevent Storage I/O Control from being enabled on a group of datastores? (Choose three.)___
A. The datastores planned for the solution are used by different vSphere clusters.
B. A datastore planned for the solution is configured as a Raw Device Mapping file.
C. A datastore planned for the solution has three extents.
D. A datastore planned for the solution is configured as NFS.
E. The organization has an Enterprise license.
【多选题】
Which two actions are prerequisites to adding ESXi 6.x hosts to a vSphere Distributed Switch? (Choose two.)___
A. Verify that there is at least one Distributed Port Group on the Distributed Switch.
B. Verify that the Distributed Port Group have active uplinks configured in its teaming and failover policy.
C. Verify that the
D. istributed Switch has been configured with a Network Profile.
【多选题】
An organization has configured Distributed Power Management (DPM) on a vSphere 6 cluster. The organization wants to be alerted when an ESXi host has been powered down by DPM. Which two options represent the type and name of the alarm that would accomplish this? (Choose two.)___
A. DrsEnteringStandbyModeEvent
B. DrsEnteredStandbyModeEvent
C. Event-based
D. Condition-based
【多选题】
Which two allow for the disabling of Network Rollback operations? (Choose two.)___
A. Modifying the vpxd advanded configuration options and adding the config.vpxd.network.rollback key
B. Modifying the C:\ProgramData\VMware\CIS\cfg\vmware-vpx\vpxd.cfg file and adjusting the<rollback> xml tag
C. Modifying the C:\ProgramData\VMware\CIS\cfg\vmware-vpx\vpxd.cfg file and adjusting the <networkrollback> xml tag
D. Modifying the C:\ProgramData\VMware\CIS\cfg\vmware-vpx\firstboot\vpxd-service- spec.prop file and adjusting the <rollback> xml tag
【多选题】
An administrator is tasked with performing a vMotion migration of a virtual machine. The virtual machine is configured as follows: <vSphere Flash Read Cache (vFRC) enabled> <Is part of a Distributed Resource Cluster (DRS) Cluster> Which two statements are true? (Choose two.)___
A. Each ESXi host in the cluster supports multiple virtual flash resources.
B. Each ESXi host in the cluster supports one virtual flash resource.
C. DRS treats powered-on virtual machines with Flash Read Cache as having a preferred affinity to their current host and moves them only for mandatory reasons.
D. DRS treats powered-on virtual machines with Flash Read Cache as having a required affinity to their current host and does not move them.
【多选题】
An administrator is using the Host Failures to Tolerate Admission Control Policy for a vSphere High Availability ___ cluster. When configuring this setting on the cluster, the administrator sees this error message: <Insufficient resources to satisfy HA failover level on cluster > What are two likely causes for the error? (Choose two.)(AB)
A. The hosts in the cluster are disconnected.
B. A host in the cluster is displaying an HA error.
C.
D. istributed Resource Scheduler has not been configured on the cluster.
【多选题】
What are two ways to identify TCP/IP stack information? (Choose two.)___
A. Using the vSphere Web Client
B. Using esxcli network ip netstack
C. Using esxcfg-netstack
D. Using the vSphere Client
【多选题】
Which two actions are required when enabling vFlash Read Cache for a virtual machine's virtual disk? (Choose two.)___
A. A value in the Virtual Flash Read Cache text box must be entered.
B. A Flash Resource Pool for Cache size reservation must be entered.
C. The Device backing and the block size must be configured.
D. The
E. nable virtual flash host swap cache check box must be selected.
【多选题】
What two IT infrastructure components are virtualized by vSphere Essentials? (Choose two.)___
A. Networks
B. Applications
C. Storage
D. Management
【多选题】
When attempting to access a virtual machine, an administrator is unable to login using the vSphere credentials. What two options are probable causes of the authentication failure? (Choose two.)___
A. The vSphere credentials have not been granted permissions.
B. The vSphere credentials are granted read-only permissions.
C. The vSphere credentials are granted no-access permissions.
D. The vSphere credentials are not a member of the local administrator group.
【多选题】
An administrator is performing a scripted installation of ESXi 6.x. In which three locations does the script need to be? (Choose three.)___
A. PXE Server
B. HTTPS
C. FTP
D. NFS
E. VVOLs Datastore
【多选题】
In order for a company to meet regulatory requirements, all ESXi 6.x Hosts must be configured to direct logs to a syslog server. What are two ways ESXi hosts can configured for this action? (Choose two)___
A. Use the esxcli system syslog command.
B. Edit them in the ESXi host Advanced System Settings.
C. From the Syslog collector user interface of the Web Client.
D. Syslog logging is not available for
E. SXi Hosts.
【多选题】
Which three actions can be executed when an alarm is triggered? (Choose three.)___
A. Send an email.
B. Send an SNMP trap.
C. Run a script or command.
D. Run an Orchestrator workflow.
E. Send a trigger to syslog.
【多选题】
An administrator is attempting to power on a virtual machine, but is unable to do so. Which two reasons are probable causes of the failure? (Choose two.)___
A. Storage access to the virtual machine swap file has been lost.
B. One of the virtual machine VMDK files is locked.
C. Virtual machine is running CentOS 7.0 64-bit.
D. Virtual machine has Hyper-Threading enabled.
【多选题】
An administrator has configured a host profile so that ESXi 6.x hosts will point to the corporate NTP server for time synchronization. The NTP server is located at 10.0.30.213, but time has not been synchronized properly across the ESXi hosts. The administrator reviews Host Profile settings as shown in the Exhibit. Which two steps are required to resolve the issue? (Choose two.)___
A. Correct the NTP server IP address.
B. Check the host for host profile compliance.
C. Remediate the host based on the updated host profile.
D. Change the NTP server to the FQDN as IP Addresses are not supported.
【多选题】
An administrator is attempting to migrate a large Hadoop virtual machine using vMotion. The administrator notices a delay when the machine is quiesced. The Hadoop virtual machine is processing many transactions a second to an in-memory database. Which two actions would help reduce the amount of time needed to perform a vMotion on this virtual machine? (Choose two.)___
A. Use multiple NICs for the vMotion vmkernel port.
B. Use a 10Gbps Network card for the vMotion vmkernel port.
C. Add an additional management network to help transmit the data quicker.
D. Disable Fault Tolerance before performing the vMotion.
【多选题】
An administrator is installing a new network card in an ESXi 6.x host that is part of a vSphere cluster. When the host is placed into maintenance mode, the vSphere Web Client displays the progress bar at 2% for over 30 minutes. Which two are likely reasons for this occurrence? (Choose two.)___
A. Maintenance mode is unable to migrate all virtual machines from the host.
B. There is a large number of virtual machines that must be migrated from the host.
C. VMware High Availability is in the process of reconfiguring the cluster.
D. Each virtual machine on the
E. SXi host must be reconfigured to recognize the new adapter.
【多选题】
Which two events happen when Distributed Resource Scheduler (DRS) is disabled? (Choose two.)___
A. The cluster's resource pool heirarchy and affinity rules are re-established when DRS is turned back on.
B. The cluster's resource pool hierarchy and affinity rules are not re-established when DRS is turned back on.
C. The cluster's resource pools are removed from the cluster.
D. The cluster's resource pools are removed from the cluster and assigned to the hosts.
【多选题】
Which two networking connection types can be configured on a virtual switch? (Choose two.)___
A. Virtual machine portgroups
B. VMkernel services (such as NFS, iSCSI, or vMotion) to the physical network
C. Web services over the Management Network
D. NFS and FCoE storage services
【多选题】
An administrator creates a DRS cluster of eight ESXi 6.x hosts. There are 10 virtual machines balanced across the hosts. An attempt to place the first host into maintenance mode fails. What are two reasons that the host failed to enter maintenance mode? (Choose two.)___
A. The DRS cluster Automation Level is set to Partially Automated mode.
B. One of the virtual machines on the ESXi Host entering maintenance mode is configured with a DRS Host affinity rule Should run on hosts in group.
C. One of the virtual machines on the ESXi Host entering maintenance mode is configured with a DRS Host affinity rule Must run on hosts in group.
D. One of the virtual machines on the
E. SXi Host entering maintenance mode is configured with an individual Automation Level set to Partially Automated.
【多选题】
When modifying a vApp, which two vSphere entities can be added? (Choose two.)___
A. A resource pool
B. A network pool
C. A vApp
D. A folder
【多选题】
From which two locations in the inventory hierarchy can you deploy a virtual machine using a template? (Choose two.)___
A. Directly from the template.
B. From a compute resource.
C. From an existing virtual machine.
D. From a Datastore.
【多选题】
A company has decided to implement Virtual SAN within their vSphere 6.x environment. The Virtual SAN cluster will be composed of three ESXi 6.x hosts that are on the Virtual SAN Ready Node list. Each ESXi host includes: <Two SAS Controllers that support Passthrough Mode> < Four Solid State Drives (SSDs) 1TB in size each> <20 SAS Magnetic Disks (MDs) 1TB in size each> <The SSDs and MDs are evenly split between the two SAS controllers>. The company will pilot a Virtual SAN cluster utilizing VMware best practices while maximizing storage capacity. The Virtual SAN cluster will use Manual Mode. Which two Disk Group configurations would meet the stated configuration requirements? (Choose two.)___
A. 4 disk groups with 1 SSD and 5 MDs each
B. 2 disk groups with 1 SSD and 7 MDs each
C. 2 disk groups with 2 SSDs and 7 MDs each
D. 2 disk groups with 1 SSD and 10 MDs each
【多选题】
A physical Windows 2008 R2 Server is converted to a virtual machine using VMware vCenter Converter. Upon completion of the conversion and subsequent power on operation, the virtual machine fails to boot and the message below is observed in the Console of the virtual machine: <STOP 0x0000007B INACCESSIBLE_BOOT_DEVICE>. Which two potential issues may be causing this boot failure? (Choose two.)___
A. An incorrect SCSI controller was selected during conversion.
B. Incompatible software drivers were migrated into the virtual machine from the source machine.
C. The vmdk file backing the virtual machine was thick provisioned.
D. A snapshot was taken immediately after the conversion completed.
【多选题】
An administrator is configuring the Failover Order option on a vSphere Distributed Switch. Which two options should be used with IP-hash load balancing? (Choose two.)___
A. Active Uplinks
B. Standby Uplinks
C. Unused Uplinks
D. Override Failover Order
【多选题】
An administrator is configuring the Maximum Transmission Unit value on a vSphere Distributed Switch. Which two options are typical values for ESXi networking? (Choose two.)___
A. 1492
B. 1500
C. 9000
D. 9089
【多选题】
Which two configurable options apply to both virtual machine CPU and memory allocation? (Choose two.)___
A. Reservation
B. Shares
C. Resource Pool
D. Reserve All
【多选题】
When attempting to power on a Virtual Machine you observe the following error: <Cannot open the disk '/vmfs/volumes/volume/vm/vm-000002.vmdk' or one of the snapshot disks it depends on.> Which three actions will be the best solutions to address this problem? (Choose three.)___
A. Verify that the virtual machine's disk files are present.
B. Investigate the host and virtual machine log files.
C. Verify the vmdk descriptor files and if required, recreate them.
D. Delete the disk file preventing the power on operation.
E. Migrate or register the virtual machine to a different host.
【多选题】
An administrator has been tasked with enabling High Availability ___ on a cluster in a vSphere 6.x environment with default settings. The cluster configures properly and there are no errors. The next day when powering on a virtual machine, an error is presented: <Not Enough Failover Resources>. Which three scenarios are likely causes of this error message? (Choose three.)(CDE)
A. The default VM Monitoring Sensitivity is set too high.
B. There are not enough datastore heartbeat datastores configured by default.
C. The default slot size in the cluster is set too high.
D. There are virtual machines with large CPU reservations.
E. A host is in maintenance mode for a replacement of a failed Hard Drive.
【多选题】
vMotion can be performed between which three physical boundaries? (Choose three.)___
A. Between two vCenter Server Systems
B. Between two vSphere Distributed Virtual Switches
C. Between two vCenter Server Datacenter objects
D. Between two VMware NSX Layer 4 segments
E. Between two NFS datastores
【多选题】
An administrator configures vSphere Replication for a virtual machine and enables multiple point in time (PIT) instances under the recovery settings in the Configure Replication wizard. Which two statements are correct for vSphere Replication with multiple point in time instances enabled? (Choose two.)___
A. vSphere Replication retains a number of snapshot instances of the virtual machine on the target site based on the retention policy that you specify.
B. vSphere Replication uses the virtual machine's snapshot instances to define the target site Point in Time instance based on the retention policy that you specify.
C. vSphere Replication does not support virtual machines with snapshots.
D. vSphere Replication supports virtual machines with snapshots.
推荐试题
【单选题】
管制员在通话过程中应当注意关键词的使用，“CPA258,expect descend in 2 minutes (or in 8 miles),maintain 7500m”这句指令中的关键词为：___
A. CPA258
B. expect
C. descend
D. maintain
【单选题】
“CPA258,expect descend in 2 minutes (or in 8 miles),maintain 7500m”这句指令这样来发：“CPA258,expect descend to F190 in 2 minutes (or in 8 miles),maintain 7500m”，您认为___
A. 差别不大，都可以
B. 都可以，且第二句更好，让机组知道将会要收到什么指令
C. 都可以，但第一句更简洁
D. 第二句指令不合适，容易让机组误解现在就“descend to F190”
【单选题】
管制员在对空指挥过程中，越是繁忙的时候，语速应___
A. 保持平稳，避免频繁重复指令
B. 尽量快些，才能指挥更多飞机
C. 降低语速，避免口误
D. 时快时慢，引起机组的注意
【单选题】
陆空通话时，什么时候推荐使用“IMMEDIATELY（立即）”这个词：___
A. 相对飞行穿高度时
B. 天气差时，担心自己会忘记某个正在改变高度的动态
C. 飞机多时，为了节省精力
D. 在紧急情况下，用于冲突解脱时
【单选题】
关键词就像一面旗帜，能帮助飞行员对即将收到的信息进行分类，警示飞行员接下来将会收到什么类型的指令，下列各项不属于我们所说的这类词的是：___
A. STAND
B. Y B.CLIMB
C. CONTACT
D. REDUCE
【单选题】
In radio telephony,the frequency 125.35 is transmitted as___
A. one two fife three fife
B. one two five tree five
C. one two fife
D. AY-SEE-MAL tree fife
【单选题】
当遇到紧急情况时，陆空通话应当：___
A. 用急促的语气，尽量大声，这样飞行员才会很配合。
B. 加重语气，适当增大音量，突出管制指令的紧迫性，争取飞行员的配合。
C. 正常语速，以免忙中出错
D. 降低语速，确保指令一次有效
【单选题】
飞行高度层10100米对应的英尺高度是___，雷达C模式实际显示的米制高度是___。___
A. 33000，10120
B. 33000，10090
C. 33100，10120
D. 33100，10090
【单选题】
在一个包含有几部分内容的指令中，合理的使用停顿，能帮助飞行员有效的记录管制员发出的指令，减少出错的几率，以下哪种停顿最有效？___
A. CCA101—descend to—flight level 210
B. CCA101—descend to—flight level 210
C. CCA101—descend to—flight level—210
D. CCA101—descend to flight level—210
【单选题】
根据区管中心业务通告，管制员在发布管制指令和检查机组复诵时，对于部分容易混淆的数字英文发音要引起足够的重视，以下哪些数字是需要着重区分___
A. 2，3，6
B. 2，3，7
C. 2，3，8
D. 2，3，9
【单选题】
以上通话，管制员接下来合理的指令是___
A. negative
B. negative，climb and maintain 10100 metres
C. affirmative，CSN3101,climb and maintain 10100 metres.
D. negative, CSN3101,climb and maintain 10100 metres.
【单选题】
对于正在接受空中交通管制服务的航空器，空中交通管制员一旦收到该航空器已收到机载防撞系统告警并已开始采取防止碰撞的机动飞行的通知，则管制员___。
A. ：A.立即利用雷达观察空中活动，给飞机提供防止相撞的指令
B. ：B.不对航空器和其它航空器或障碍物之间的间隔负责，但应提供空中活动通报
C. ：C.根据具体情况让飞机改变高度或航向
D. ：D.A、A.B和C
【单选题】
管制员在对空指挥过程中，应当主动地控制一句管制指令中所包含的管制指令的内容。一般情况下，管制员发布的一句管制指令中，包含的管制内容不应当超过___项
A. 1
B. 2
C. 3
D. 4
【单选题】
当观察到两个或多个雷达位置指示符相近，或观察到在同时作相似的移动以及遇到其它引起对目标怀疑的情况时，管制员应当___。
A. ：A.根据进程单和现有雷达信息仍可以提供雷达管制服务
B. ：B.向移交方了解是否是航空器的原因
C. ：C.应当采用两种以上识别方法进行识别直至确认为止
D. ：D.首先报告领班主任
【单选题】
TCAS告警过程中，管制员应当___。
A. ：A.管制员应重视驾驶员通报的TA（TRAFFIC ALERT） 情况和提出的请求，保持相关的航空器之间的间隔
B. ：B.当管制员得知航空器正在按RA（RESOLUTION ADVISORY）进行机动飞行时，不得向航空器发布与RA相抵触的指令
C. ：C.只要情况许可，管制员应当向受机动飞行影响的航空器提供相对活动信息
D. ：D.A、A、B和C
【单选题】
当雷达显示器上出现7600编码时，在确认该航空器的无线电接收机还具有接收能力后，雷达管制员___。
A. ：A.应当指挥航空器就近着陆
B. ：B.应当停止提供雷达管制服务
C. ：C.可以继续提供雷达管制服务
D. ：D.以上都可以
【单选题】
关于区管中心冲突解脱指引：优先调配的因素和原则应包含以下中的①飞行员 ②航空器 ③相对位置 ④飞行状态 ⑤避让方向 ⑥航空器目的地 ⑦水平和高度相结合___
A. 1234567
B. 123456
C. 123457
D. 12345
【单选题】
关于区管中心冲突解脱指引：在避让方向上，应考虑的因素___①限制区②危险区③禁区④陆地和海洋 ⑤军航活动区⑥危险天气⑦高空风
A. A.①②③④⑤⑥⑦
B. B.①②③⑤⑥⑦
C. C.①②③④⑤⑥
D. D.①②③④⑤⑦
【单选题】
关于区管中心冲突解脱指引：当出现发出的指令被干扰、飞行员复述错误等情况时，管制员应___
A. A.听天由命
B. B.排查波道干扰因素
C. C.重新综合预估判断，并视情况修改调配方案
D. D.盲目发送同一指令
【单选题】
关于区管中心冲突解脱指引：对于两冲突航空器，通过改变高度可以尽快达到安全的垂直间隔，同时还要注意防止出现高度反复穿越。以下方法正确的是___ ①如果两冲突航空器已经保持相同高度，应尽快让其中一架航空器快速上升，另一架则快速下降（即加速穿越）。②两冲突航空器之间垂直间隔已小于规定间隔，接近于穿越状态，应指挥两机沿之前的接近方向加速穿越并尽快形成安全垂直间隔（即加速穿越）。③两冲突航空器之间垂直间隔足够大，则应指挥高高度航空器尽快上升，低高度航空器尽快下降，形成安全垂直间隔（即终止穿越）。
A. A.①②③
B. B.①③
C. C.①②
D. D.②③
【单选题】
关于区管中心冲突解脱指引：当航迹夹角为α，且0°<α≤135°,两冲突航空器均未过交叉点时应采取___
A. A.指挥两冲突航空器均向外侧作适当角度的改航。
B. B.指挥两冲突航空器均向内侧作适当角度的改航。
C. C.基于判断，采取航向避让时，两航空器均不会冲过交叉点，指挥两冲突航空器均向外侧作至少90°的改航。
D. D.基于判断，采取航向避让时，两航空器均不会冲过交叉点，指挥两冲突航空器均向内侧作至少90°的改航。
【单选题】
关于区管中心冲突解脱指引：以下停止下降(上升）例句，正确的是___
A. A.南方3501，有冲突！立即停止下降(上升）。
B. B.南方3501，有冲突！立即停止下降(上升），立即停止下降（上升）。
C. C.南方3501，立即停止下降(上升）。有冲突！
D. D.南方3501，立即停止下降(上升），立即停止下降（上升）。有冲突！
【单选题】
在A461航路上执行PBN航路运行的航空器，当地面雷达失效后说法正确的是___
A. 继续按照PBN程序飞行，为其提供程序管制服务
B. 终止PBN导航，按照传统的导航程序，提供程序管制服务
C. 通知航空器雷达失效，建议其就近机场备降
D. 继续按照PBN程序飞行，使用雷达间隔提供管制服务
【单选题】
当空中航空器报告应答机完全故障时，管制员应当___？
A. 如果有一次雷达航迹显示，经重新识别后，可继续提供雷达管制服务
B. 如果没有任何雷达航迹显示，应为该航空器提供程序管制服务，与其他航空器之间配备程序间隔
C. 对于RVSM空域内运行的航空器，如果证实该航空器仍然具备满足RVSM运行能力，可以允许其继续在RVSM空域内运行
D. A、A.B、B.C均正确
【单选题】
在TCAS发生RA事件后，在下列情况下，管制员恢复向所有受影响的航空器提供间隔的责任:___
A. 管制员雷达上看到飞机已经解除冲突后
B. 管制员未确认飞行员己恢复原来的空中交通管制许可
C. 管制员确认飞行员正在恢复当前空中交通管制许可后，发出更改的许可，并被驾驶员确认
D. 管制员认为没有影响时
【单选题】
ACAS/TCAS使用的防相撞的基础理论：利用Dr John S Morrell导出的距离/距离变化率的概念，此概念基于到达两架航空器最接近点所需的________。___
A. 速度
B. 高度
C. 时间
D. 距离
【单选题】
在遵守公司经批准的运行程序的情况下，当航空器到达指定高度的 ______范围之内时，飞行员应限制垂直速度不大于每分钟______，这将有利于减少不必要的RA发生的可能性。___
A. 1500英尺，1000英尺
B. 2000英尺，1500英尺
C. 1500英尺，500英尺
D. 1000英尺，500英尺
