通过采用WDM技术，可以在一根光纤中同时实现2个方向的信息传输
查看答案
采用带外监控方案的监控信道OSC不能穿过光线路放大器EDFA
A. 对
B. 错
The customer service level of e-business has been improved.
A. 对
B. 错
Customers always find pop-upchat window on visiting a website annoying.
A. 对
B. 错
Customer service answers question concerning pre-sale services of the products.
A. 对
B. 错
微信支付 
支付宝支付