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初生木质部
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初生木质部
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理学
〔植物形态与结构〕
释
primary xylem
初生木质部
维管植物的初生生长过程中,由原形成层分化产生的木质部。
Biology
primary xylem
初生木质部
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tour interpretation system
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tourism
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tourism area life cycle
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tourism concentration ratio
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