基干路由有什么特点？
参考答案：
基干路由的特点是呼损率小于等于1%，且其话务量不允许溢出至其他路由。
, and you will realize your dream of being successful.
A．Making great efforts
B．To make your efforts
C．A bit more effort
D．If you double your efforts
函数Mid("123456789",3,4)返回的值是______。
A．123
B．1234
C．3456
D．456
