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下一篇：羽毛的由来和作用 上一篇：瓜尔豆胶： 广泛应用于面条 方便面 肉制品 调味品尼龙绳分为绳皮和绳芯，中间的绳芯是平行并列或编制成辫状的尼龙丝，它提供大部分抗拉力和缓冲作用。外层覆以平滑编制的尼龙绳皮，主要作用是保护绳心；绳皮粗糙的，相