跨度大于2m、小于8m的现浇混凝土板拆除时,混凝土强度应达到设计强度的( )。
A.50% B.75%C.80%D.100%
参考答案:B
— will she stay here?
— For .
A.How soon, one hour and a half
B.How long, one and a half hours
C.How soon, one and half hours
D.How long, one hour and half
读图完成问题。
图中代表地壳的是()
A.①
B.①②
C.②③
D.①②③