大豆与谷类同时食用可起到蛋白质互补作用，主要是因为大豆蛋白中富含谷类蛋白中缺乏的（）

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Great changes have taken place in Hongxing Cotton Mill in the past ten years. It had only 400 workers in 1997, but there are as many as 3,000 now. Now the mill...