97免费在线观看视频,亚洲综合自拍网,黄色毛片免费观看,热久久综合网,免费看日产一区二区三区狠狠操av,久久久涩涩涩,在线精品免费视频,人人插天天干,久久91精品国产91久久

<dl id="knpc1"></dl>

單項(xiàng)選擇題

Lubricating oil should be changed on a heavy duty diesel engine when（）.

A.it gets dark in color
B.a sample rubbed between fingers feels thin
C.it has been in use for a specified interval
D.it no longer supports combustion

你可能感興趣的試題

單項(xiàng)選擇題

If your propeller is racing in rough weather，you should（）.

A.decrease your engine speed
B.ignore it
C.increase your engine speed
D.stop your engine until the rough weather passes

單項(xiàng)選擇題

If you are unable to stop a diesel engine by any other means，you should（）.

A.discharge a CO₂ extinguisher in the air inlet
B.pull off the distributor cap
C.secure the jacket water
D.secure the starting air supply valve