单项选择题

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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单项选择题

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

单项选择题

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

单项选择题

A.air supply is shut off
B.fuel supply is shut off
C.water supply is shut off
D.safety valve lifts