当建筑物内的火灾荷载在300~400N/m2时,一、二级耐火等级建筑物的耐烧时间约为()。
(A)20min
(B)30min
(C)40min
(D)50min
参考答案:C
It was not until Mum agreed to take her to KFC, ____was her favorite, ____the girl stopped crying. [ ]
A. that; that
B. which; which
C. that; which
D. which; that
洗炉料须加在边缘,洗炉过程中严禁()。