问题
单项选择题
耐火等级为一级的厂房和仓库建筑构件的屋顶承重构件，其耐火极限为（）h。
A.3.00
B.2.50
C.2.00
D.1.50
答案
参考答案：D
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耐火等级为一级的厂房和仓库建筑构件的屋顶承重构件，其耐火极限为（）h。
A.3.00
B.2.50
C.2.00
D.1.50
参考答案：D
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2. Mary is _ _ than Rick. But Bob is . 3. Mary is _ _ than Rick. But Bob is _. 4. Bob is than Mary, and he is . |