In the grinding activity,the consumption of grinding medium is great,which takes a half of grinding cost.To raise grinding efficiency and reduce directly or indirectly the grinding cost,the relation between grinding medium and grinding efficiency are analyzed and the optimum conditions for grinding are found out.
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(2025-6-4)
Criminology34
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孤独的根号三
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贪玩的秋柔
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潇洒的惋清
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