单项选择题
A.850nm B.1350nm C.1550nm D.1650nm
A.1000 B.1500 C.2000 D.2500
A.0.15dBB.0.25dBC.0.35dBD.0.45dB
A.1.266 B.1.366 C.1.466 D.1.566
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