题目内容

In a water tube boiler, circulation is developed by the difference in the( )( 1 )tube length and various diameters; (2)densities of the hot and cold water

A. only ( 1 )
B. only ( 2 )
C. both ( 1 )and (2)
D. neither (1 )nor (2)

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

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