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【单选题】
常态下阀门的阀口,当工作油路压力低于阀门的调定压力时,阀门不工作,阀口处于最大打开状态。当外负载增大,系统压力升高到阀门的调定压力时,阀门开始工作,阀口,出口压力为阀门的调定压力,当系统压力继续升高时,阀门的阀口关的更小,但此时出口压力不变,将恒定在阀门的调定压力值。该段文字叙述的阀门为?
A.
顺序控制阀
B.
单向阀
C.
减压阀
D.
溢流阀
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C.
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A.
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B.
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【简答题】Direction: Complete the following sentence with a proper word from your textbook on P. 106. Change the form if necessary. The movie will be coming to your shortly. (n. pl.)
查看完整题目与答案
【单选题】The movie will be ____ in time for Christmas.
A.
released
B.
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C.
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A.
they will go to receive her at the airport.
B.
they will hold a proper welcoming ceremony.
C.
they will play the drums aloud to welcome her.
D.
they will organized a dancing party to welcome her.
查看完整题目与答案
【简答题】A.His friends will be available to see the movie. B.The tickets are cheaper than the Thursdays, C.There will be more friends to go to the cinema. D.The film will be more moving than the Thursdays.
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B.
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查看完整题目与答案
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