填空题:我国最长的河流______长江,全长约6300000米,用科学记数法可表示为______。

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题目内容:
我国最长的河流______长江,全长约6300000米,用科学记数法可表示为______。
参考答案:
答案解析:

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第43题应填__________ A.explain B.keep C.study D.improve

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