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【判断题】
的电影从某种角度上讲具有一种社会活化石的作用。A.
正确
B.
错误
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【简答题】接触器的主触点用于接通或分断所控制的_____,一般只有_____触点。其辅助触点用于____电路中,常有两对常开和常闭触点,起电气联锁作用,故又称联锁(自保或互锁)触点。
【简答题】I know it is wrong to envy your children. But when I see my son, Tonio and his younger brother Sam going down a slide together, one’s arm around the other, I know I have missed something wonderful. No...
【简答题】阅读理解。 When I was ten, my mother worked all day so I had to take care of my younger brother. At that time my little brother was about four years old and he missed mum all the time. One day, after I had...
【单选题】液力偶合器也叫液力联轴器。它用在电动机与减速器之间，是应用动液传递能量的一种传动装置。主要由（）主要部件组成。
A.
主动轴
B.
涡轮
C.
从动轴
D.
泵轮
E.
防止漏油的传动外壳
【简答题】常开主触点用于通断 ______________ ,常开辅助触点用于通断 ______________ 。
【简答题】When I was ten, my mother worked all day so I had to take care of my younger brother. At that time my little brother was about four years old and he missed mum all the time. One day, after I had given...
【单选题】My younger brother couldn't work out the answer and ______. [ ]
A.
so could I
B.
nor could I
C.
so can I
D.
nor I could
【简答题】接触器( )用于电动机的启停控制,接触器( )用于电动机的制动控制,由变压器和整流元件构成的整流装置提供制动直流电源。 制动过程:在图(a)控制电路中,按下复合按钮SB1时,其常闭触点切断( )线圈电路,同时其常开触点接通( )线圈电路,使KM1主触点切断三相电源,KM2主触点接通( )进行制动;松开( ),KM2线圈断电,制动结束。 由于用复合按钮控制,制动过程中按钮必须始终处于( ...
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