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複 並 列 型 維 管 束 (bicollateralvascular bundle )----------------------------- cortex----------------------------------------------- phloem 外 韌 皮 部------------------------------------------- vascular cambium--------------------------------------- metaxylem----------------------------------------------- xylem 木 質 部----------------------------------------------- protoxylem-------------------------------------------- phloem 內 韌 皮 部Cucurbita sp. 南 瓜 莖 橫 切 面 stem C.S. 100x
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