问题描述：
[单选]
The engine is started with（）supplied from air receivers．
A．pressure oil
B．pressure water
C．compressed air
D．cooling water
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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 engine may lose power or slow down during running， when this occurs， the first cause possible may be hot bearings and（）of the pistons in the cylinders．
下一篇：The engine is reversed by axial displacement of the camshafts In order for this to be carried out， the cams are（）with inclined transition faces．
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