单项选择题
A.end B.web C.pin D.journal
Lubricating oil for an engine is stored at the bottom o...
单项选择题Lubricating oil for an engine is stored at the bottom of the （）, known as the sump or in a drain tank located beneath the engine.
A.sea cheat B.air receiver C.crankcase D.water box
Low compression results from （）.A.a worn cylinderB.brok...
单项选择题Low compression results from （）.
A.a worn cylinder B.broken piston rings C.either A or B D.none of the above
Low compression of diesel engine may result from （）A.a ...
单项选择题Low compression of diesel engine may result from （）
A.a worn cylinder B.broken piston rings C.any of A and B D.none of the above
