《建筑设计防火规范》规定四级耐火等级建筑防火墙的耐火极限不低_爱下问搜题

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问题单项选择题

《建筑设计防火规范》规定四级耐火等级建筑防火墙的耐火极限不低于（）h。

A．1

B．2

C．3

D．4

答案

参考答案：C

解析：本题考查的是建筑耐火等级的要求。根据教材表格，所有等级防火墙的耐火极限不应小于3h。故本题答案为C。

补全对话，情景问答

用所给方框中的单词填空。

from, o'clock, is, speak, went, meeting, of, watching, with, working

A: Mr White, what were you doing at eight o'clock last night?
B: Er..., I was going home _____________ a meeting.
A: What _____________?
B: A parents' meeting at school.
A: I see. OK, Mrs Black, what were you doing at eight yesterday evening?
C: I was _____________ late.
A: Working? At eight o'clock in the evening?
C: Yes. There were about ten _____________ us there last night. We were working late.
A: OK, now, Mr Brown, what were you doing at eight _____________ last night?
D: Um, I was _____________ TV _____________ my wife.
A: I see, oh, where _____________ your wife, please? Can I _____________ to her?
D: Sorry, she isn't here today. She _____________ to England yesterday.

问答题简答题

颞下颌关节紊乱病镜下的主要病理改变。