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luckclover:BK7材料SCHOTT玻璃牌号 Lf^5Eo/ 5A 折射率 1.51680 [xtK"E# 耐酸性 1 { r6]MS#l1 K氏硬度 610 (2013-01-09 09:53) 0{0;1.ZP
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