消防控制室内火灾报警控制器安装在墙上时，靠近门轴侧面距离不应小于()
A.0.5m
B.0.8m
C.1m
D.1.2m
参考答案：A
中药质量的优劣主要取决于
A．有效成分或有效物质群的含量
B．各种化学成分的含量
C．主要化学成分的含量
D．水溶性化学成分的含量
E．醇溶性化学成分的含量
An investor gathered the following information on three zero-coupon bonds: 1 - year, $600 par, zero-coupon bond valued at $571 2 - year, $600 par, zero-coupon bond valued at $544 3 - year, $10600 par, zero-coupon bond valued at $8901 Given the above information, how much should an investor pay tbr a $10000 par, 3 - year, 6 percent, annual-pay coupon bond（）
A. $10000.
B. $10600.
C. $10016.
