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單項選擇題

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）

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單項選擇題

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

單項選擇題

Latent heat changes the （） of water.

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

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