单选题Which of the listed types steam traps operates on the principle that hot water flashes to steam when its vapor pressure is rapidly reduced?（）ABall floatBThermostaticCBimetallicDImpulse
单选题
Which of the listed types steam traps operates on the principle that hot water flashes to steam when its vapor pressure is rapidly reduced?（）
A
Ball float
B
Thermostatic
C
Bimetallic
D
Impulse
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