单项选择题 Which of the following conditions is most likely to occur when unburned fuel contaminates the crankcase of a diesel engine?（）

单项选择题 If a few injector spray holes become plugged, the result could be （）

单项选择题 The sludge tank installed in the diesel engine room is used to collect（） Ⅰ.sludge from the fuel oil settling tanks ad centrifuge Ⅱ.water that has been collected in the settling tank