單項(xiàng)選擇題

A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water （）.

A.around the engine
B.around the cooler
C.to the expansion tank
D.overboard

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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

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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