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【简答题】
请同学们判断以下设备哪些属于旅客可使用范围?哪些不属于
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反馈参考答案：
举一反三
【单选题】So far hundreds of flights ____ because of the heavy fog .
A.
are canceled
B.
will be canceled
C.
were canceled
D.
have been canceled
【简答题】单位脉冲函数 的拉氏变换式是( ); 单位阶跃函数 的拉氏变换式是( ); 单位斜坡函数t的拉氏变换式是( ); 单位斜坡函数 的拉氏变换式是( );
【单选题】We were stuck at the airport because of the heavy fog, otherwise we ________ here in time for the conference.
A.
arrived
B.
had arrived
C.
would arrive
D.
would have arrived
【单选题】All flights ______because of the heavy fog, we had to decide to take the train.
A.
were canceled
B.
having canceled
C.
having been canceled
D.
have been canceled
【单选题】—Attention, please. The plane has to be put ______ because of the heavy fog. —Oh, bad luck! We have to wait now.
A.
on
B.
away
C.
up
D.
off
【单选题】The flight to New York was ________ because of the heavy fog.
A.
put off
B.
put away
C.
put out
D.
put up
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