题目内容
Which of the following statements is NOT the characteristic of fire-tube boiler?( )
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Marine boilers are used for producing steam which may be used for the following except( )
In which of the listed components is chemical energy converted to thermal energy with regards to boiler operation?( )
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
The function of a safety valve on a marine boiler is to prevent the pressure in the boiler fromrising above( )
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