单项选择题
A.40×10G B.80×10G C.160×10G D.160×40G
A.20ps/nm.km B.6ps/nm.km C.17ps/nm.km D.4ps/nm.km
A.10GHZ B.20GHZ C.50GHZ D.100GHZ
A.2M B.155M C.622M D.10G
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