EPON网络中,OLT收光最小过载光功率是多少?()
A.-8dB
B.-17dB
C.-18dB
D.-27dB
参考答案:A
I ________ walking in the garden ________ watching TV in the room.
A.like; instead
B.would rather; than
C.prefer; than
D.prefer; to
高压管子热弯时,不得用煤或焦炭做燃料,应当用木炭做燃料,以免()。
A.腐蚀
B.变形
C.淬火
D.渗碳