The thermostatic valve has a throttling action that is to say the valve can .A.stop the r

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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

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗