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單項(xiàng)選擇題

The water in an auxiliary boiler should be tested for chloride content to determine （）.

A.total dissolved solids
B.salt contamination
C.water hardness
D.chlorine contamination

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單項(xiàng)選擇題

Cooling the intake air supplied to a diesel engine will （）.

A.reduce mean effective pressure
B.decrease average compression pressure
C.decrease air charge density
D.increase power output

單項(xiàng)選擇題

Excessive vibration of an automatically fired auxiliary boiler can be caused by （）

A.air or water in the furnace
B.combustion pulses
C.fuel oil pump failure
D.flame failure

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