组成细胞的各种化学元素中,最基本元素、微量元素可以分别用下图中的哪些字母表示
A.e、b
B.a、e
C.d、e
D.a、d
答案:C
某无梁楼盖柱网尺寸为6m×6m,柱截面尺寸为450mm×450mm,楼板厚200mm,如图2- 27所示,混凝土强度等级为C25,箍筋采用 HPB235钢,弯起钢筋采用HRB335钢,as=20mm。
该楼板不配置抗冲切钢筋时,柱帽周边楼板的受冲切承载力设计值最接近于()kN。
A.403
B.456
C.492
D.504
It is reported that some mainland visitors to Hong Kong Disneyland didn't ________ the park rules
and behaved improperly. [ ]
A. come up to
B. keep to
C. come about
D. make up