你可能感興趣的試題

The water level showing in a boiler water gauge glass is usually （） during working.

A.higher than the actual drum water level
B.equal to the actual drum water level
C.increasing due to steam condensation in the glass
D.lower than actual drum water level

單項(xiàng)選擇題

A dazzling white burner flame in the boiler furnace indicates （）.

A.no combustion
B.deposits in the fuel
C.excessive air in the fuel
D.cold fuel oil

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

你可能感興趣的試題

The water level showing in a boiler water gauge glass is usually （） during working.

A dazzling white burner flame in the boiler furnace indicates （）.

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