单项选择题

In a diesel engine lube oil system, which of the following parts should be lubricated first?（）

A.Camshaft beatings
B.Main bearings
C.Piston crowns
D.Cylinder walls

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单项选择题
Before starting a diesel engine that has an engine driven lube oil pump, the engineer should （）.

A.open the bypass line
B.cut in the lube oil cooler
C.pressurize the lube oil system
D.top off the expansion tank
单项选择题
The small end of the connecting rod is attached to the piston with a （）.

A.crankpin
B.sliding wedge
C.wrist pin
D.torque bashing
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