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【简答题】
简述液压传动系统对液压控制阀的基本要求.
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【单选题】This is one of the most interesting films _____ shown last week.
A.
which was
B.
that was
C.
which were
D.
that were
【单选题】Most asteroids, which are made of rock, _themselves_ a belt between the orbits of Mars and Jupiter.
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transform…to
B.
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C.
confine …to
D.
limit…by
【简答题】热敏电阻有()和()之分。