单项选择题：高炉内炉料下降的动力是（）。 A.气压 B.煤气的浮力 C.炉料与炉墙摩擦力 D.重

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一个HTML 文件的启始标记为（）。

A．

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高炉内炉料下降的动力是（）。 A.气压 B.煤气的浮力 C.炉料与炉墙摩擦力 D.重

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