单项选择题
Air scavenging of a diesel engine cylinder（）
A.blows out the exhaust gases B.supplies oxygen for combustion C.cools the valves and cylinder walls D.all of the above
单项选择题 The term diesel engine scavenging means（）
单项选择题 A diesel generator has just been paralleled with an AC turbo-generator, but the load can not be properly divided.This could be caused by（）
单项选择题 The process of scavenging a two-stroke/cycle diesel engine serves to（）
