單項(xiàng)選擇題

Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are （）.

A.operated manually once an hour
B.operated until the engine has started
C.placed into operation only at maximum load
D.adjustable to meet lubrication requirements

你可能感興趣的試題

單項(xiàng)選擇題

Bottom blow valves are installed on auxiliary water-tube boilers to （）

A.remove suspended and precipitated solids from the boiler water
B.completely drain the boiler in an emergency situation
C.prevent hardened scale deposits in the water drum
D.remove floating impurities from the oily water surface

單項(xiàng)選擇題

A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water （）.

A.around the engine
B.around the cooler
C.to the expansion tank
D.overboard

无码高清视频|成人自拍视频|欧美成人午夜无码A片秀色直播|草美女视频网站|美女被操网站在线观看

Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are （）.

你可能感興趣的試題

Bottom blow valves are installed on auxiliary water-tube boilers to （）

A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water （）.