题目内容

X62W铣床的( A )采用了反接制动的停车方法。

A. 主轴电动机M1
B. 进给电动机M2
C. 冷却泵电动机M3
D. 风扇电动机M4

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20/5t桥式起重机接通电源,扳动凸轮控制器手柄后,电动机不转动的可能原因 ( )。

A. 电动机的定子或转子回路开路
B. 熔断器FU1~FU2太粗
C. 电阻器1R~5R的初始值过小
D. 热继电器FR1~FR5额定值过小

If you are not familiar_____ the operation of this machine, please ask our assistant for help.

A. for
B. on
C. in
D. with

No matter what business you run, get prepared ____ the chanllenges of IoT.

A. for
B. to
C. on
D. under

We believe that 5G will have a strong impact ____ marketing and advertising.

A. in
B. with
C. on
D. about

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