單項(xiàng)選擇題

Latent heat changes the （） of water.

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

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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

單項(xiàng)選擇題

In motor ship, （） is often used to recover some of the heat carried in the exhaust gases from the main engine.

A.an diesel oil heater
B.a waste heat boiler
C.a fresh water generator
D.all the above