单项选择题
A.the filter to operate more efficiently B.the lube oil cooler to be bypassed C.positive lube oil pump suction to be assured D.galvanic action in the cooler to be minimized
In a large, slow-speed, main propulsion diesel engine, ...
单项选择题In a large, slow-speed, main propulsion diesel engine, which of the parts listed is under tension when the engine is running?（）
A.Bed plate B.Column C.Entablature D.Tie rod
The color of the exhaust from a diesel engine should be...
单项选择题The color of the exhaust from a diesel engine should be （）
A.clear B.hazy light brown C.hazy light blue D.hazy light grey
Scavenging in a four-stroke/cycle diesel engine occurs ...
单项选择题Scavenging in a four-stroke/cycle diesel engine occurs during the （）.
A.last part of the exhaust stroke, and the first part of the intake stroke B.last part of the intake stroke only C.early part of the injection stroke only D.early part of the power stroke
