皮皮学，免费搜题
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【单选题】
关于气阀重叠角的错误论述是( )。
A.
气阀重叠角有利于燃烧室扫气
B.
非增压机气阀重叠角比增压机的小
C.
所有型号的柴油机都存在气阀重叠角
D.
二冲程柴油机不存在气阀重叠角
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【判断题】直流他励电动机进入回馈制动状态时，电车下坡就是属于回馈制动状态，电车将动能转化为电能反馈到电网中去。
A.
正确
B.
错误
查看完整题目与答案
【单选题】电车下坡属于 制动。
A.
回馈制动
B.
反接制动
C.
能耗制动
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【判断题】电动车下坡属于正向回馈制动。
A.
正确
B.
错误
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【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
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【单选题】电车下坡属于( ) 制动。
A.
回馈制动
B.
反接制动
C.
能耗制动
D.
其余都不对
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【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( );
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【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
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【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
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【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
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【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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相关题目：
【判断题】直流他励电动机进入回馈制动状态时，电车下坡就是属于回馈制动状态，电车将动能转化为电能反馈到电网中去。
A.
正确
B.
错误
查看完整题目与答案
【单选题】电车下坡属于 制动。
A.
回馈制动
B.
反接制动
C.
能耗制动
查看完整题目与答案
【判断题】电动车下坡属于正向回馈制动。
A.
正确
B.
错误
查看完整题目与答案
【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
查看完整题目与答案
【单选题】电车下坡属于( ) 制动。
A.
回馈制动
B.
反接制动
C.
能耗制动
D.
其余都不对
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【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( );
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【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
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案