One end of a cylinder for a medium or high-speed diesel engine is sealed by the piston and

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One end of a cylinder for a medium or high-speed diesel engine is sealed by the piston and rings, the other end is sealed by the ________.

A.crankcase

B.cylinder head

C.valve cover

D.engine frame.

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗