Unverified80% confidenceDecision RuleTime unknown
黏液含量高低反映山药品种而非新鲜度：铁棍山药黏液黏稠但量少（粉性），水山药黏液稀多；用黏液判断新鲜应看是否拉丝顺滑，切口氧化发黑变褐说明放置过久或受冻
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80%
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Long-term
Relevance
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