【单选题】
数控机床液压卡盘处于正卡且在高压夹紧状态下，其夹紧力的大小是由 管路上的减压阀来调节的 ___
A. 高压
B. 低压
C. 中压
D. 超低压
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【单选题】
关于 PLC 诊断功能的说法，错误的是 ___
A. 可以利用 PLC 中央处理器的运算来诊断故障
B. 可以利用梯形图来判断 PLC 控制系统故障
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D. 可以利用输入输出指示灯的状态来判断 PLC 控制系统故障
【单选题】
C.功能测试法 D.参数分析法 13266. 不可能造成数控系统的软件故障 ___
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【单选题】
C.数控系统零部件损坏 D.数控系统参数错误 13269.数控系统中对各电路板供电的系统电源大多数采用 电源 ___
A. 开关型稳压
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C. 交流 220V
D. 桥式整流
【单选题】
如果某数控车床，当系统电源接通后，显示器出现系统报警，同时显示页面不能正常转换 ___排除这种故障通常采用的方法是 (A)
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【单选题】
数控机床操作面板主要由 开关、主轴转速倍率调整旋钮、进给倍率调节旋钮、各 种辅助功能选择开关、手轮、各种指示灯等组成 ___
A. 操作模式
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【单选题】
C.编辑方式（Edit） D.回零方式（REF） 13276.当机床三色灯的红色灯亮时，表示 ___
A. 机床有故障
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【单选题】
MDI 运转可以 ___
A. 通过操作面板输入一段指令并执行该程序段
B. 完整的执行当前程序号和程序段
C. 按手动键操作机床
D. 可以解决 CNC 存储容量不足的问题
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