单项选择题
A.M600 B.M721 C.M920 D.M720
A.M820 B.M721 C.ZXONE 8500 D.ZXONE 8700
A.5~6dB B.7~9dB C.1~2dB D.9~12dB
A.STM-1 B.STM-16 C.10GE-LAN D.STM-64
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