A.reciprocating pumps B.positive displacement pumps C.centrifugal pumps D.centripetal pumps
A.Piston pump B.Screw pump C.Diffuser pump D.Water-ring pump
A.Red B.White C.Blue D.Yellow
A.The blow down valve B.The scum valve C.The air release cock D.The soot-blower
A.an diesel oil heater B.a waste heat boiler C.a fresh water generator D.all the above