问题描述：
[单选]
The remaining oil in the lubricating pipes and ducts should be blown out with（）．
A．atmosphere
B．the fresh water
C．compressed air
D．chemical compound
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答案解析：无
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上一篇：The removal of（）from lubricating oil will reduce engine wear and possible breakdowns．
下一篇：The quantity of oil injected into the cylinder can be regulated（）．
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