[单选题]起吊活塞组件应（），以防超重（）。

正确答案 ：D

以上均是

[单选题]Cooling of engine is achieved by circulation a cooling liquid around internal passages within the （）.

正确答案 ：C

engine

[单选题]In a diesel engine, excessive cylinder liner wear will cause （）(1) increased blow-by(2) wear between the piston ring and groove

正确答案 ：C

both (1) and (2) are correct

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