The correct pH value of boiler water is achieved by continuous addition of a suitable ____

Which of the following may hardness of the boiler water cause？ （1) scale formation; （2) tube failure; （3) corrosion.

In a （) boiler the water flows through the inside of the tubes while the hotgases pass ro

The pH value of water in a diesel engine closed cooling water system should be maintained

What does NOT affect the value of the free surface correction （).A.Width of the tankB.Leng

When lighting off an auxiliary boiler, which of the problems listed could cause the burner

The correct procedure for giving an auxiliary boiler a bottom blow, is to begin .A.when th