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單項(xiàng)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

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單項(xiàng)選擇題

Latent heat changes the （） of water.

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

單項(xiàng)選擇題

（） 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