地下、半地下建筑（室）和一类高层建筑的耐火等级不低于（）。

搜题请搜索小程序“爱下问搜题”

问题单项选择题

A.一级

B.二级

C.三级

D.四级

答案

参考答案：A

解析：地下、半地下建筑（室）和一类高层建筑的耐火等级不低于一级。

选择题

All these gifts must be mailed immediately ________ in time for Christmas. [ ]

A. in order to have received

B. in order to receive

C. so as to be received

D. so as to be receiving

判断题

制定比赛阵型主要依据对方队的队员特点和打法。