【简答题】【消耗次数：1】
电力起动机启动是以[填空]电动机为动力源
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相关题目
【简答题】
辅助汽油机启动是以小型[填空]汽油机为动力源
【简答题】
汽车起动机，通常由直流电动机，[填空]和操纵机构三部分组成
【单选题】
三相电动机启动时，利用自耦变压器来降低加在电动机定子绕组上的起动电压。待电动机起动完成后，再使电动机与自耦变压器脱离，从而在全压下正常运行的方式是（ ）。
①
定子绕组串接电阻降压启动
②
自耦变压器降压启动
③
Y（星）—△（三角）降压启动
④
延边△降压启动
【单选题】
在机床电力拖动中要求油泵电动机启动后主电动机才能运行，接触器KM1控制油泵电动机，接触器KM2控制主电动机，则在控制电路中必须( )。
①
KM1的动合触点串入KM2的线圈电路中
②
KM1的动断触点串入KM2的线圈电路中
③
KM2的动断触点串入KM1的线圈电路中
④
KM2的动合触点串入KM1的线圈电路中
随机题目
【单选题】
It was well known that Thomas Edison _____ the electric lamp.
①
discovered
②
invented
③
found
④
developed
【单选题】
The garden _______while the Greens were away from home.
①
took good care of
②
was taken good care
③
was taken good care of
④
was taking good care
【单选题】
We’ve missed the last bus. I’m afraid we have no ________ but to take a taxi.
①
way
②
choice
③
possibility
④
selection
【单选题】
I didn’t know what to do, but then an idea suddenly ________ to me.
①
appeared
②
happened
③
occurred
④
emerged
【单选题】
Youve caught a cold. Youd better _______to school.
①
go
②
to go
③
not go
④
not to go
【单选题】
________ you are leaving tomorrow, we can have dinner together tonight.
①
Since
②
While
③
For
④
Before
【单选题】
Australia is one of the few countries ____ people drive on the left of the road.
①
which
②
that
③
where
④
on which
【单选题】
He _______ driving me home, even though I told him I lived nearby.
①
insisted on
②
insisted at
③
insisted that
④
insisted in