Before a marine diesel engine is started the cylinders and pistons must be （）.

时间：2020-08-14 02:02:28 关键词：engine,is,started

Before a marine diesel engine is started the cylinders and pistons must be （）.

A.cooled to appropriate temperature

B.warmed up gradually to appropriate temperature

C.opened up and renewed

D.ground and polished

答案解析

B

举一反三

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