题目内容

数控机床进给控制系统的三环结构,从内到外分别为____、____和____。

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交流异步伺服电机输出功率高,价格低,常用于数控机床进给驱动系统。

A. 对
B. 错

在放大电路中,当负载RL=1KΩ时,输出电压为1V,负载电阻断开时,输出电压上升到1.1V,则该放大电路的输出电阻R0为( )。

A. 100Ω
B. 150Ω
C. 50Ω

My brother and I __________ walking the family dog.

A. take turns
B. takes turns
C. by turns
D. in turn

It is said that these sandstorms _________ the desert.

A. origin in
B. originates from
C. originate in
D. originated from

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