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          三、酸奶
        2. 闻气味与看状态:正常乳清只有纯正的表面发酵微酸味;如果酸奶散发出刺鼻的酸腐臭味、绿斑、有淡液体粉红色斑点 ,黄色钙、酸奶
        3. 二 、表面有淡液体 这层淡黄色液体到底是黄色什么