The crankcase of many diesel engines are kept under a slight vacuum by the （）.

时间：2020-08-14 01:14:16 关键词：many,diesel,engines

The crankcase of many diesel engines are kept under a slight vacuum by the （）.

A.scavenging action of the piston

B.piston type vacuum pump taking suction off a differential manometer

C.gland exhausting manometer

D.crankcase exhaust fa

答案解析

D

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