Unverified80% confidenceDecision RuleTime unknown
山药断面接触空气后氧化变红或发黑说明多酚含量高但已不新鲜，优质铁棍山药断面应呈白色带黏液且久放不易变色，须根密集、表皮有'锈斑'的更粉糯
1
Sources
80%
Confidence
Long-term
Relevance
-
First Seen
Sources
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