单项选择题

As for a oil-fired boiler too much air would indicated by （）.

A.yellowish flame
B.golden yellow flame
C.milky flame
D.brilliant white flame

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单项选择题

As for an oil-fired boiler if at a normal steaming condition and water goes out of sight in gauge glasses the action you should take is: （）
(1) secure oil to fires
(2) increase feed pump pressure

A.（1）
B.（1）and（2）
C.（2）
D.neither（1）nor（2）

单项选择题

The amount of heat released by steam when it changes to water at the same temperature is called（）.

A.latent heat of condensation
B.latent heat of vaporization
C.latent heat of saturation
D.sensible heat of condensation

单项选择题

Latent heat changes the （） of water.

A.physical state
B.temperature
C.atmospheric pressure
D.sensible pressure