单项选择题

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

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单项选择题

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

单项选择题

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

单项选择题

A.Magnesium
B.Paper
C.Wood
D.Diesel Oil