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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

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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

單項(xiàng)選擇題

After a normal, or safety shutdown, automatic combustion control systems for an auxiliary boiler are designed to prevent the immediate refiring of a burner in order for the （）.

A.furnace to be re-purged
B.electric charge to buildup in the igniter
C.fuel pump to restart
D.dram level to stabilize

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