城市次干道红线宽度为( )m。
A．30～50 B．35～65 C．40～70 D．45～80
参考答案：A
For a moment nothing happened. Then all shouting together.
A．voices had come
B．came voices
C．voices would come
D．did voices come
E1业务不通的可能原因（）
A.承载E1业务的隧道故障
B.两端E1接口配置的成帧模式不一致
C.2M电缆故障
D.两端配置时钟模式不一致
