比方,
一斤豆腐 含钙 10克,
五斤豆腐 压成 一斤豆腐干,
一斤豆腐干 含钙 50克,
总的单位 含钙量 未变,化学成分依旧,
比方,
一斤豆腐 含钙 10克,
五斤豆腐 压成 一斤豆腐干,
一斤豆腐干 含钙 50克,
总的单位 含钙量 未变,化学成分依旧,
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