For one or two types of engine the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through （）.

时间：2019-04-14 12:09:08 关键词：the,engine,piston

For one or two types of engine,the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through （）.

A.the cylinder cover

B.the bottom of bed-plate

C.the sump

D.the crankcase door

答案解析

D

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