每年对光缆线路的空余光纤测试一次，以下哪一项不是测试内容（）。
A．衰减
B．色度色散
C．偏振模色散
D．衰减距离
参考答案：D
The woman asked the policeman where ________. [ ]
A. the post office is
B. the post office was
C. is the post office
D. was the post office
申办种子生产许可证要经过哪些程序？
