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【单选题】
( )一般安装在液压泵的出口处,并联在系统中使用,用以使系统中多余的油液溢回油箱,保持系统压力稳定,当系统过载时,通过溢流阀起安全保护作用。A.
减压阀
B.
顺序阀
C.
溢流阀
D.
调速阀
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举一反三
【单选题】What has the man been doing recently?
A.
He has been working.
B.
He has been studying.
C.
He has been on a camping trip.
【简答题】What has Spirit found that has been exposed to water?
【单选题】What change has been made in the marketing arrangement?
A.
A new consultancy has been contracted.
B.
A new director has been appointed.
C.
The present department has been expanded.
【简答题】马克思主义哲学认为世界在本质上是（ ）。
【单选题】According to statistics, _________ of the total area of Alaska has been used for farming.
A.
as fish does
B.
because of its rich natural resources
C.
by the United States in the 19th century
D.
shines day and night
E.
only a very small percentage
F.
a limited amount of the gold found there.
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