99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

<strong id="kl6as"></strong>

<ins id="kl6as"></ins>

單項(xiàng)選擇題

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

你可能感興趣的試題

單項(xiàng)選擇題

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

單項(xiàng)選擇題

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