题目内容
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[多选题]
In a ZTE DWDM implementation, which of the following boards should be attached with la
A.Optical transmit unit (OTU)
B.Optical add/drop multiplexer (OAD)
C.4-channel 644M sub-rate convergence board(SRM42)
D.2-channel Gigabit Ethernet convergence board(GEM2)
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