单项选择题
A.of crosshead type B.of trunk piston type C.of low speed type D.all the above
Main bearings are required to support the crankshaft at...
单项选择题Main bearings are required to support the crankshaft at each （）.
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
