英语词汇“class-b door”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	class-b door
释义	class-B door class-B door A door having a 1- or 1 ½-hr fire-endurance rating, suitable for use as a closure in a class-B opening, such as fire exits and passageways.
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class-B door