单项选择题
A.20dBm B.21dBm C.23dBm D.25dBm
A.400Mbps B.867Mbps C.1300Mbps D.1733Mbps
A.10GE&10SFP&4SFP+ B.10GE&10SFP&8SFP+ C.12GE&12SFP&4SFP+ D.12GE&12SFP&8SFP+