germanium-doped silica core single mode fiber 掺锗石英心单模光纤 germanium-doped silica fiber 掺锗石英光纤 germanium-immersed thermistor detector 锗浸没热敏电阻探测器 ..
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germanium-doped silica core multimode fiber 掺锗石英心多模光纤
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