单项选择题

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

A.lube oil
B.fuel oil
C.turbine oil
D.grease

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单项选择题

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）

单项选择题

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

单项选择题

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