单项选择题
In a four-cycle diesel engine piston blow-by can result in increased（）
A.crankcase pressure B.compression pressure C.scavenge pressure D.exhaust manifold pressure
单项选择题 The most effective method in removing water from diesel fuel oil is by（）
单项选择题 On board supply vessels, a centrifuge is normally used to purify（）
单项选择题 Water accumulating in the crankcase of a diesel engine could indicate（）
