问题描述：
[单选]
The lubricating pipes and dusts 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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答案解析：无
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上一篇：The lubricating system for the cylinder walls is different from the bearings in that the oil for former one is supplied in（）while that for latter one is（）．
下一篇：The lubricating oil is pumped from the drain tank， very often with（）in the suction line．
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