当采用檐沟外排水时，沟底沿长度方向设置的纵向排水坡度一般应不小于（）
A.0.5％
B.1％
C.1.5％
D.2％
参考答案：B
计算36°-20°32′=______．
The issuance of asset backed securities (ABSs) versus straight debt would be desirable if:（）
A. a better credit quality is desired on the asset backed versus the corporation.
B. there are regulatory constraints on the deal.
C. the corporation’s credit rating may go up in the future.
