GPON系统采用WDM技术，实现单纤双向传输（非强制）。
参考答案：对
A．10Hz，5A
B．10Hz，10A
C．5Hz，5A
D．5Hz，10A
(In) June, 1846, (near) Sacramento, California, a (number) of new settlers rebelled in the Bear Flag Revolt and (proclaiming) California an independent republic.
A．In
B．near
C．number
D．proclaiming
A