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

99色精品-9色在线-99色在线-99色视频 国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

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 （）.

99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

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