题目内容

The function of a safety valve on a marine boiler is to prevent the pressure in the boiler fromrising above( )

A. design test pressure
B. maximum allowable working pressure
C. the pressure used in the accumulation test
D. the hydrostatic test pressure

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A. slack enough to allow slight leakage of fluid
B. slightly blocked
C. brought up tight so as not to allow any leakage
D. fitted with a relief valve

A. one
B. two
C. three
D. four

A. depending on
B. in relative to
C. regardless of
D. because of

A. injector pumps
B. positive displacement pumps
C. centrifugal pumps
D. centripetal pumps