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蒋正华先生是中国女性人口学的创始人。()

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回转是通过绕轴旋转截面来创建特性,即“面动成体”()

下列选项中,属于路面结构的有()。()错误、表层正确、基层C、垫层D、面层

We have found oil under the North Sea.(英译中)

I didn't quite follow; could you explain it again?(英译中)

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