【单选题】
___属于成形类数控机床。
A. 数控冲床
B. 数控车床
C. 数控铣床
D. 数控激光切割机床11248.当 NC 故障排除后，按 RESET 键（ ）。
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答案
A
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【单选题】
C.利用磁盘机读入程序 D.从网络通过 Modem 接收程序11250.数控机床加工调试中若遇到问题需停机，应先停止___。
A. 进给运动
B. 辅助运动
C. 主运动
D. 冷却液
【单选题】
请找出下列数控屏幕上菜单词汇的对应英文词汇 SPINDLE.EMERGENCY STOP 、FEED.、COOLANT ___。
A. 主轴、急停、进给、冷却液
B. 冷却液、主轴、急停、进给C.主轴、冷却液、急停、进给 D.进给、主轴、冷却液、急停
【单选题】
关于数控系统的串口通讯，错误的说法是___。
A. 如果数据传输不正常，可以通过拔下数据通讯线进行复位，然后再插上通讯线
B. 确认数控系统串口功能是否已开通
C. 确认上位机软件里的参数设置和数控系统里面的串口参数是否一样
D. 进行串口通讯前，首先检查传输线是否完好
【单选题】
在数控程序传输参数中，“9600E71”，分别代表___。
A. 波特率、奇偶校验、数据位、停止位
B. 数据位、停止位、波特率、奇偶校验C.波特率、数据位、停止位、奇偶校验D.数据位、奇偶校验、波特率、停止位
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程序编制中首件试切的作用是___。
A. 检验程序单的正确性，并检查是否满足加工精度要求
B. 检验零件工艺方案的正确性
C. 检验零件图样的正确性
D. 检验数控程序的逻辑性
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数控加工的批量生产中，当本道工序定位基准与上道工序已加工表面不重合时，就难以保证本道工序将要加工表面与上道工序已加工表面之间的___。
A. 位置精度
B. 表面质量
C. 尺寸精度
D. 形状精度
【单选题】
C.加工程序验证 D.优化加工过程11289.不完全定位是指___。
A. 根据工件的加工要求，有时并不需要限制工件的全部自由度。
B. 工件的六个自由度全部被限制的定位。一般当工件在 x、y、z 三个坐标方向上均有尺寸要求或位置精度要求时采用。
C. 根据工件的加工要求，应该限制的自由度没有完全被限制定位。此种定位无法保障加工要求，所以是绝对不允许的。
【单选题】
D.重复限制工件的同一个或几个自由度的现象。此种定位往往会带来不良后果，应尽量避免。11290.___适用凸模或较浅的型腔三维曲面工件的粗铣加工。
A. 等高层铣
B. 平行加工
C. 垂直插铣
D. 仿形加工
【单选题】
工件以外圆柱面定位时，常用以下几种定位元件。其中___既能用于完整的圆柱面定位，也能用于局部的圆柱面定位，且对中性好。
A. V 形块
B. 定位套
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关于粗基准的选择和使用，以下叙述不正确的是___ 。
A. 当工件表面均需加工，应选加工余量最大的坯料表面作粗基准
B. 粗基准只能用一次
C. 选工件上不需加工的表面作粗基准
【单选题】
D.当工件所有表面都要加工，应选用加工余量最小的毛坯表面作粗基准11298.精基准是用___作为定位基准面。
A. 加工后的表面
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___在一定的范围内无需调整或稍加调整就可用于装夹不同的工件。这类夹具通常作 为机床附件由专业厂生产，操作费时、生产率低，主要用于单件小批量生产。
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D.信息获取与处理、控制规则集、推理机和传感器12008.专家系统的核心部分是___。
A. 知识库、数据库、推理机构
B. 人机接口、过程接口、推理机构
C. 人机接口、知识获取结构、推理机构D.知识库、数据库、人机接口
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某模糊控制器的语言变量选为实际温度与给定温度之差即误差 e、误差变化率△e；以及加热装置中可控硅导通角的变化量 u，故该模糊控制器为___。
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I’ll be happy to help you, ___ you won’t take up too much of my time.
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___ they have written about the behaviors of animals is hardly anything new.
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The investigation ___ evidence of a large-scale illegal trade in wild birds.
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Showing some sense of humor can be a(n) ___ way to deal with some stressful situations.
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The newspaper didn’t mention the ___ of the damage caused by the fire.
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Do you ___ her novels as serious literature or as mere entertainment?
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He doesn’t ___ of buying a house this year because the bank has refused to lend him any money.
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A. would like
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Bullying (恃强欺弱) can ___ a climate of fear and anxiety in school, and prevent students from focusing on their schoolwork.
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Science can now ___ many things which were thought to be mysterious by ancient people.
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