砌体结构房屋的承重体系有（）
A.横墙承重体系
B.纵墙承重体系
C.纵横墙承重体系
D.内框架承重体系
E.框架承重体系
参考答案：A, B, C, D
—Why does the river smell terrible?
—Because large quantities of water__________．
A．have polluted
B．is being polluted
C．has been polluted
D．have been polluted
根据我国票据法，汇票的付款到期日有几种规定方法
