题目内容

词汇与结构It draws fluid from the reservoir and ________ it to the system through the filter and a check valve and the system pressure can be built up.

A. excels
B. expels
C. excludes
D. impels

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词汇与结构The engine driven pumps are used in main hydraulic ________ systems.

A. force
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C. flier
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A. manually
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D. completely

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A. functioning
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C. malfunctioning
D. malfunctioned