根据建筑物的耐火性能,我国将建筑物划分成()个耐火等级。
(A)2
(B)3
(C)4
(D)5
参考答案:C
读一读,写一写。
Dear Mum and Dad,
I'm in New York now. I 1._____ (arrive) yesterday. Grandma and Cousin Simon 2._____ (meet) me
at the airport. It 3._____ (be) very 4._____ (excite). We 5._____ (go) in a taxi to their flat.
New York is very beautiful. There are lots of tall buildings and lots of cars and 6.______ (people).
Everyone 7. _____ (speak) English.
Grandma 8._____ (make) Chinese food for me. But I want to 9._____ (try) American food. I want
to 10._____(find) out about America. I will 11._____ (write) again soon.
From,
Damning.
进行预应力筋安装时,其品种、级别、规格及数量必须符合设计要求。( )