第14题: [单项选择]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 参考答案:D 答案解析:[解题思路] 弄清在暖气下进行蒸气密封的作用。
[详细解答] “vapor”为“gaseous form into which certain liquid or solid substance c