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單項(xiàng)選擇題

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

A.（1）and（2）
B.（1）and（3）
C.（2）and（3）
D.（1），（2）and（3）

單項(xiàng)選擇題

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

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The separation of impurities and water from （） is essential for good combustion of diesel engines.

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

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

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