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【单选题】
( )是主要用在控制电路中作短时间接通或断开小电流电路。用于远距离手动控制各种电磁开关,也可以用作转换各种信号线路和电气联锁线路等。A.
刀开关
B.
按钮
C.
主令控制器
D.
组合开关
手机使用
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反馈参考答案：
举一反三
【单选题】—Why did you come by bus? ---My car broke down yesterday evening and I ____ it repaired.
A.
didn’t have
B.
don’t have
C.
won’t have
D.
haven’t had
【单选题】Why did they get wet?
A.
Because it began to rain very hard and they didn't have an umbrella.
B.
Because there was nowhere to hide from the rain.
C.
Both A and B
【简答题】半卧位或坐位时男性腹膜腔的最低点是____陷凹,女性腹膜腔的最低点是____陷凹。
【单选题】—Why didn’t you help him? —I __________, but I didn’t have the money.
A.
I did have
B.
I would have
C.
will have
D.
must have
【单选题】Why did the woman have problems getting the book from the library?
A.
It wasn't published recently.
B.
It is in great demand.
C.
It was sold out already.
D.
It isn't owned by the library.
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