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【单选题】
关于电力拖动起货机的电动机与控制设备,下列说法正确的是 。A.
起货机的电动机采用防水式电机
B.
起货机的起动、加速过程与操纵主令控制器的速度有关
C.
起货机控制线路不设缺相保护
D.
起货机的制动环节一般只采用电磁制动器制动
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举一反三
【单选题】-Hello, may I talk to John please? -( ).
A.
Sorry, he is busy at the moment
B.
No, you can't
C.
Sorry, you can't
D.
I don't know
【单选题】I ______ that John will come to the party. He's busy preparing for an examination.
A.
suspect
B.
doubt
C.
expect
D.
think
【单选题】— Is John coming over this weekend? — He should, but he _______ not. He seems to be busy these days.
A.
can
B.
may
C.
must
D.
will
【单选题】John is busy ______ his girlfriend ______ her paper.
A.
help⋯with
B.
to help ⋯with
C.
helping⋯with
D.
to help⋯
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