Is it safe? New beef rules aim to stop mad cow disease. But they may not be enough--and there's too much we don't know 期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Is it safe? New beef rules aim to stop mad cow disease. But they may not be enough--and there's too much we don't know

作者姓名：	Brink S Shute N

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