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【题目】习惯上划分东西半球的分界线是()

A.20°W,160°EB.20°E,160°W

C.0°经线和0°纬线D.0°经线和180°经线

【答案】A

【解析】

根据东西半球分界线是20°W160°E组成的经线圈,20°W以东、160°E以西为东半球,20°W以西、160°E以东为西半球.南北半球的划分是以0°纬线即赤道为界,赤道以北为北半球,以南为南半球,进行分析解答。

任何两条相对的经线(经度之和为180°),都组成一个经线圈;任何一个经线圈,都把地球分成相等的两个半球;东经180°和西经180°,实际上重合为一条经线,即180°经线。国际上习惯用20°W160°E这两条经线组成的经线圈,作为划分东西半球的界线,因为这个经线圈基本上是从海洋通过,避免了以0°和180°经线划界,将欧洲和非洲的一些国家分隔在两个半球上。故选A

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