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下图为小麦根尖结构模式图，据图回答。（4分） （1）在根尖结构中，具有保护作用的是[ ] ； （2）细胞始终保持分裂能力的部位[ ] ； （3）根细胞不断伸长的部位是[ ] ； （4）吸收水分和无机盐的主要部位是[ ] 。
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