單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

The linear motion of a diesel engine piston is converted to the rotary motion required to drive gears, propeller shafts, and generators by the （）.

A.flywheel
B.crankshaft
C.journal bearings
D.camshaft