单项选择题
The lube oil cooler is located after the lube oil filter in order for （）
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
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?（）
单项选择题 The color of the exhaust from a diesel engine should be （）
单项选择题 Scavenging in a four-stroke/cycle diesel engine occurs during the （）.
