单项选择题

High diesel engine cooling water temperatures can be caused by （）.

A.air in the cooling system
B.an overhauled water pump
C.correct amount of coolant
D.no air in the cooling system

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单项选择题
The rotary motion of a diesel engine crankshaft is obtained from the up and down motion of the piston via the （）.

A.camshaft
B.reduction gears
C.rocker arm
D.connecting or piston rod
单项选择题
High diesel engine cooling water temperatures can be caused by （）.

A.a worn water pump
B.not enough coolant
C.air in the cooling system
D.all of the above
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