Cross scavenging requires the fitting of () to prevent air or exhaust gas escape when the piston is at the top of the stroke.

时间:2019-04-13 16:36:16 关键词:to,of,air

Cross scavenging requires the fitting of () to prevent air or exhaust gas escape when the piston is at the top of the stroke.

A.a exhaust valve

B.a piston skirt

C.a piston crown

D.an air suction valve

答案解析

B