问答题

决定区域水资源状态的三要素？

答案：正确答案：决定区域水资源状态的三要素：降水、径流、蒸发

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( ) is recognized around the world as the home of The Queen.

A．Buckingham Palace
B．Westminster Abbey
C．Westminster Palace
D．the Hyde Park

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电机和变压器常用的铁心材料为软磁材料。

A．对
B．错