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【单选题】
三相异步电动机正反转控制线路中,性能最佳的联锁控制线路是( )A.
按钮联锁
B.
接触器联锁
C.
机械联锁
D.
接触器和按钮联锁
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举一反三
【单选题】As I don't know _____ to take up Miss Rose's course because of her wedding leave, I have to ask her students about it . [ ]
A.
how
B.
what
C.
where
D.
whether
【单选题】I ______ that we would be able to leave tomorrow, but it's beginning to look difficult.
A.
hope
B.
hoped
C.
have hoped
D.
had hoped
【单选题】－I my keys in the room yesterday. I had to get in the window. －It’s dangerous to do that.
A.
leave, from
B.
left, through
C.
forget, from
D.
forgot, through
【单选题】Should I leave earlier tomorrow morning? ()
A.
Yes, it's better to leave earlier to avoid the morning traffic.
B.
Yes, you will.
C.
No, you won't.
【单选题】—Excuse me, visiting hours are over．It' s time for you to leave． —I' m sorry, I didn't know the time or I ______ earlier．
A.
will leave
B.
would leave
C.
had left
D.
would have left
【单选题】I ______ that we would be able to leave tomorrow, but it's beginning to look difficult.
A.
had hoped
B.
has hoped
C.
hope
D.
hoped
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