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1．55μm光纤的损耗通常只有()

高老师2年前 (2024-03-27)通信概论(04742)11

1．55μm光纤的损耗通常只有()

A.0．1dB／km

B.O．2dB／km

C.0．3dB／km

D.O．4dB／km

正确答案是B

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