单项选择题

It’s important to have vapor seals on the warm side to ______.

A．avoid gas when the air cools
B．avoid mist when the air cools
C．avoid rapor when the air cools
D．avoid moisture when the air cools

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单项选择题

It’s important to have vapor seals on the warm side to ______. 您的浏览器不支持 audio 元素。