A.by trial and error
B.by and large
C.automatically
D.very easily
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A.catch plates
B.dampers
C.regulating valves
D.fans
A.few
B.little
C.a little
D.less
A.pressure
B.temperature
C.density
D.volume
A.pressure
B.temperature
C.density
D.volume
A.the saturation temperature is higher
B.the higher the saturation temperature
C.the higher is the saturation temperature
D.the saturation temperature is more high
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