16.将一株植物在�暗环境中放置48小时然后将一片叶的主脉切断在阳光下照射4小时将此叶片脱色处理后再用碘液处理结果a部�棕褐色b部 Template




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tomski16.将一株植物在�暗环境中放置48小时然后将一片叶的主脉切断在阳光下照射4小时将此叶片脱色处理后再用碘液处理结果a部�棕褐色b部 coloring