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單項(xiàng)選擇題

The intake valves in a diesel engine are reseated by （）.

A.cam followers
B.push rods
C.combustion gases
D.valve springs

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單項(xiàng)選擇題

The outlet from an expansion tank of a closed freshwater cooling system should be piped to the （）.

A.cylinder head water outlet header
B.cylinder jacket inlet main
C.heat exchanger inlet connection
D.jacket water pump suction line

單項(xiàng)選擇題

Passages are drilled in the crankshafts of diesel engines to provide lubricating oil to the （）.

A.main bearings
B.connecting rod bearings
C.piston pin bushings
D.All of the above

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