T68镗床主轴电动机只有低速挡,没有高速挡时,常见的故障原因有()等。A、时间继电器

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问题:

T68镗床主轴电动机只有低速挡,没有高速挡时,常见的故障原因有()等。

A、时间继电器KT不动作

B、行程开关SQ2安装的位置移动造成的SQ2处于始终断开的状态

C、行程开关SQ2安装的位置移动造成的SQ2处于始终接通的状态

D、时间继电器KT的延时常开触点损坏使接触器KM5不能吸合

E、时间继电器KT的延时常闭触点损坏使接触器KM4不能吸合

考点:高级维修电工高级维修电工题库
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判断下列句子是否符合短文内容。符合的写T,不符合的写F.(T=True,F=False)

Beijing is the capital of China and can be easily reached by train, plane or bus. There are two main train stations in Beijing. One is in the center and can be reached by subway; the other is in the southwest of Beijing and can easily be reached by bus.

The city itself has good transportation. The total length of the subway in the city is about 200 km. It’s convenient. Passengers can buy tickets from vending machines at entrances to the subway.

The roads in the city are excellent . The traffic runs quite well except during rush hours(高峰期) in the morning and evening when people drive to and from work .

Some buses in Beijing have a box near the driver . You can put money into the box when you get on the bus . Payment on these buses is usually one Yuan no matter (无论)how far you go . Other buses have a conductor. His or her job is to collect money from passengers . On these buses , the price is usually based on(依据) how far you travel .

小题1:. You can’t get to Beijing by ship .

小题2:. There’re two main subway stations in Beijing .

小题3:. Passengers can buy tickets at entrances to the subway.

小题4:. There’re no conductors on all the buses .

小题5:. No matter how far you go , you only need to pay one Yuan

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平板印刷主要依据“油水相溶”原理。

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数控线切割加工一般作为零件加工的最后一道(),使零件达到图样规定的尺寸、形位精度和表面质量。

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下列各项中,不属于质量检验计划内容的是( )。

A.编制检验流程图,确定适合作业特点的检验程序

B.编制质量控制手册

C.合理设置检验站

D.编制测量工具、仪器设备明细表

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在感觉记忆中,信息主要以( )形式存储。

A.语义
B.概念体系
C.图式
D.视像和声像

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