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1銆佹懇鎿︾郴鏁�(sh霉)coefficient of friction
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-----4S姗¤啝锛孖RD纭害90±2
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2銆佹脯瑭︾敤鏉愭枡
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------220铏熺⒊鍖栫绮夋湯
------400铏熺⒊鍖栫鐮傜礄
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寮忎腑锛�
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