gumrosin
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供应优级松香树脂黄松香块拔毛焊接松香大量现货
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松香 松香 gum rosin 松香具有粘合,软化,增涩磨擦,亮光,防腐,绝缘等
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gum rosin with 100% purity and >166 acid number, available in
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gum rosin for use in electronic solder
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脂松香(蒸汽法),马尾松或湿地松 【简称】:松香 【英文】:gum rosin
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