单项选择题
A.open late and close early B.open late and close late C.fail to open when the engine is cold D.fail to open at normal operating temperature
Lubricating systems for diesel engines are usually desi...
单项选择题Lubricating systems for diesel engines are usually designed to initially provide lube oil to the engine （）
A.camshaft beatings B.main bearings C.piston crowns D.cylinder walls
The expansion tank in a diesel engine closed freshwater...
单项选择题The expansion tank in a diesel engine closed freshwater cooling system is located at （）
A.the highest point in the system B.the lowest point in the system C.near the floor D.plate level or near the tank top level
On most modern diesel engines, the main and connecting ...
单项选择题On most modern diesel engines, the main and connecting rod bearings receive their lubricating oil by （）.
A.banjo feed B.splash feed C.gravity feed D.pressure feed
