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    a(chn)ƷCϢ|(zh)δӋ

ܰѣՈMÌHķߴʩƷҪM(jn)ƷCһ棨؛SC뾳zCAC¹ڲzy棩

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ܣһNӲĥW(xu)ܷĹ}VҪVɷSiO2

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ӢQuartz sand

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ʮ죺ڷ朽YwΠ;׃Ҏʹе͸ߜÛϵС߶Ƚ^͸gЧCЧԼ䪚صĹW(xu)

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