单选题The thermostatic valve has a throttling action, that is to say the valve can（）Astop the refrigerant from flowingBforce the refrigerant to flowCcause the refrigerant pressure to riseDcause the refrigerant pressure to fall
单选题
The thermostatic valve has a throttling action, that is to say the valve can（）
A
stop the refrigerant from flowing
B
force the refrigerant to flow
C
cause the refrigerant pressure to rise
D
cause the refrigerant pressure to fall
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