城市用地竖向规划采用台阶式,当保护台地的挡土墙高度超过6.0m时,宜退台处理。试问退台的宽度不能小于多少( )
A.1.0m
B.1.5m
C.2.0m
D.2.5m
参考答案:A
不属于1岁以内婴儿计划免疫的是()。
A.脊髓灰质炎疫苗
B.肺炎链球菌疫苗
C.麻疹疫苗
D.百日咳疫苗
E.乙肝疫苗
A non-callable bond with 18 years remaining maturity has an annual coupon of 7 percent and a $1000 par value. The current yield to maturity on the bond is 8 percent. Which of the following is closest to the effective duration of the bond()
A. 9.63.
B. 11.89.
C. 8.24.