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P-SiO2-20
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P-SiO2-50
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P-SiO2-100
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SiO2
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SiO2
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SiO2
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20nm
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50nm
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100nm
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±È±íÃæ»ý
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250 m2/g
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200 m2/g
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150-200 m2/g
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SiO2º¬Á¿
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99.9£¥
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99.9£¥
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99.9£¥
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0.15 g/cm3
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0.18 g/cm3
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0.2 g/cm3
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PHÖµ
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5-7
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5-7
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5-7
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