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【单选题】
电网电压正常情况下,启动过程中软启动器“欠电压保护” 动作。此故障原因不可能是( )。 A.“欠电压保护”动作整设定不正确 B.减轻电流限幅值 C.电压取样电路故障 D.晶闸管模块故障A.
B.
C.
D.
D
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【单选题】---When is Jim's birthday? ---________ August 11th. [ ]
A.
They're
B.
It's
C.
Jim's
D.
Here
【简答题】不可逆循环热效率一定小于可逆循环热效率?
【单选题】— Could you tell me____________? — Over there.
A.
where does Jim live
B.
where Jim lives
C.
when will Jim come back
D.
when Jim will come back
【单选题】When the writer says that Jim has a full-time job at home, he means Jim ______.
A.
makes shoes in his home
B.
does extra work a night
C.
does his own car and home repairs
D.
keeps house and looks after his children
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