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）
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相关考题
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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 -
单项选择题
（） will be used to blow away the combustion products from the tube surfaces.
A.The blow down valve
B.The scum valve
C.The air release cock
D.The soot-blower
