External balanced thermal expansion valve works is based on the basis of force balance.

外平衡势热力膨帐阀的工作原理是建立在力平衡的基础上。

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External balanced thermal expansion valve works is based on the basis of force balance.

外平衡势热力膨帐阀的工作原理是建立在力平衡的基础上。

youdao