【单选题】
公司锅炉末级过热器出口短集箱温度高报警值是___℃.
A. 410
B. 430
C. 575
D. 590
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答案
D
解析
暂无解析
相关试题
【判断题】
在协调方式下，锅炉和汽机并行操作。在这种方式下锅炉控制汽机机前主汽压力，汽机控制功率，两者相互影响。负荷变化过程先于锅炉指令信号，同时压力变化过程修正调门位置
A. 对
B. 错
【判断题】
汽机跟随方式是指当汽机主控A/M站在手动，锅炉主控A/M站在自动时采用这种方式。在这种操作方式下，汽机控制汽机入口蒸汽压力，同时汽机调门采用手动调节以获得期望的功率。在这种方式下，主蒸汽压力设定值MSP与汽机入口蒸汽压力进行比较，其偏差△MSP经发电机输出信号前馈和修正后产生锅炉主控信号BID去风/燃料/水控制回路，操作员设定汽机调节阀位置建立负荷指令
A. 对
B. 错
【判断题】
锅炉跟随方式是指当汽机主控A/M站在自动，锅炉主控A/M站在手动时采用这种方式。在这种方式下，锅炉控制汽机入口蒸汽压力，通过调节锅炉的燃烧率来获得期望的负荷。操作员在锅炉主控A/M站上手动设定BID指令，从而改变锅炉能量水平
A. 对
B. 错
【判断题】
数据采集系统（DAS）就是实时采集发电机组在运行过程中的各种运行参数及状态，经过计算机处理，转换成相应的工程量或状态值，通过CRT显示器、打印机或报警装置等提供给运行值班人员作为监视和操作的依据
A. 对
B. 错
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27.20世纪80年代末、90年代初，随着东欧剧变和苏联解体，持续近半个世纪的冷战格局被打破。 “___ ” 是当前乃至今后相当长时期内世界主要战略力量对比的总体态势和总体特征。
【单选题】
What is an example of social engineering？___
A. gaining access to a computer by observing the user login credentials
B. gaining access to a build through an unguarded entrance
C. gaining access to a server by using a USB stick
D. gaining access to a server room by posing as local IT
【单选题】
Which type of Layer 2 attack enables the attacker to intercept traffic that is intended for one specific recipient？___
A. BPDU attack
B. DHCP starvation I LAB
C. MAC address spoofing
D. CAM table overflow
【单选题】
Which about nested policy maps in a zone-based firewall is true ?___
A. They are limited to two leve ls in a hierarchical policy
B. Parent policies are previously defined policies that are defined by using the service policy command
C. A child policy is a new policy that uses a pre-existing policy.
D. A child policy is a new that uses a pre-existing policy
【单选题】
In which configuration do you configure the ip ospf authentication key 1 command？___
A. routing process
B. interface
C. privileged
D. global
【单选题】
Which statement about command authorization and security contexts is true？___
A. If command authorization is configured， it must be enabled on all contexts.
B. The change to command invokes a new context session with the credentials of the currently
C. AAA settings are applied on a per-context basis
D. The enable. 15 user ang admins with chang to permission ha e dfferent command authorization levels pertontext
【单选题】
Which command do you enter to enable authentication for OSPF on an interface？___
A. router（config-if）#ip ospf message-digest-key 1 md5 CIS COPASS
B. router（config-if）#ip ospf authentication message-digest
C. router（config-if）#ip ospf authentication-key CISCOPASS
D. router（config-if）#area 0 authentication message-digest
【单选题】
What feature defines a campus area network？___
A. It has a single geographic location
B. It lacks external connectivity.
C. It has a limited number of segments.
D. It has limited or restricted Internet access
【单选题】
Which type of attack most commonly involves a direct attack on a network？___
A. :phishing
B. Trojan horse
C. denial of service
D. social engineering
【单选题】
What information does the key length provide in an encryption algorithm?___
A. the cipher block size
B. the hash bloc k size
C. the number of permutations
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How do you verify TaCACS+ connectivity to a device？___
A. You successfully log in to the device by using the local credentials
B. You connect via console port and receive the login prompt.
C. You connect to the device using SSH and receive the login prompt.
D. You successfully log in to the device by using ACS credentials
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Which term best describes the concept of preventing the modification of data in transit and in storage？___
A. availability
B. confidentially
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Which loS command is used to define the authentication key for ntp？___
A. switch（config ）#ntp authentication-key 1 mds Clcs
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C. switch（config）#ntp trusted-key 1
D. switch（config）#ntp source 192.168.0.1
