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    【题目】零度经线叫___________，零度纬线叫____________。

    【答案】本初子午线 赤道

    【解析】

    人们为了便于区分各条纬线和经线，都给他们标注了不同的度数。赤道（0°纬线）是地球上最长的纬线圈，它是划分南北半球的分界线；赤道以南称南纬（S表示），以北称北纬（N表示），各有90°；纬线指示东西方向；国际上将通过英国格林尼治天文台旧址的经线作为经度的起点线（即0°经线--又叫本初子午线），以这条线向东为东经（E表示），以西为西经（W表示），各有180°；经线指示南北方向。赤道是划分南北半球的分界线；20°W和160°E组成的经线圈是划分东西半球的分界线。

    经线又叫子午线，0°经线又叫本初子午线，该线以东是东经，以西是西经，0°纬线叫赤道，以南是南纬，以北是北纬。

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