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單項(xiàng)選擇題

The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of （）.

A.seawater contamination
B.frequent surface blows
C.dissolved oxygen deaeration
D.frequent bottom blows

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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

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

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