问题描述：
[单选]
The loss of（）from an air compressor could lead to an overheated air discharge and possibly an explosion in the pipelines leading to the air reservoir．
A．lubricating oil
B．compressed air
C．cooling water
D．sealing ring
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答案解析：无
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上一篇：The lower end of each piston rod is reduced in diameter to fit a bore in（）．
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