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如图脐带血管有3条,A是____的答案

如图脐带血管有3条,A是______,B是______。血管周围胶样结缔组织如图中C称为______。
 

未知题
2021-12-28 11:33
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正确答案
脐动脉;脐静脉;华通胶

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