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单词
humic substances
释义
humic substances
原型:
humic substances 是 humic substance 的复数
腐殖物质; 土壤和沉积物等中,除有机体中已知的各类有机化合物(非腐殖物质)以外的各种淡棕色至暗褐色的天然高分子化合物的总称。它由胡敏酸、富啡酸和胡敏素等三类物质组成。
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riveting
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riveting by machine
RIVETING chains or chain links
riveting clamp
riveting clamps
riveting cold
riveting device
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更新时间:2026/9/22 23:23:08