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【题目】下面有关经线和纬线的说法正确的是(  )

A.每条经线的长度都是相等的B.经线与经线之间是相互平行的

C.经线和纬线的形状都是一个圆D.每条纬线的长度都是相等的

【答案】A

【解析】

经线是连接南北两极并同纬线垂直相交的半圆,也称子午线,经线指示南北方向;所有经线都呈半圆状且长度相等;两条正相对的经线形成一个经线圈;任何一个经线圈都能把地球平分为两个半球。纬线是在地球仪上,顺着东西方向,环绕地球仪一周的圆圈。所有的纬线都相互平行,并与经线垂直,纬线指示东西方向。纬线圈的大小不等,赤道为最大的纬线圈,从赤道向两极纬线圈逐渐缩小,到南、北两极缩小为点。

经线是连接南北两极的半圆,每条经线的长度都是相等的,故A说法正确;经线与经线之间是垂直相交的,故B说法错误;经线的形状为半圆,纬线的形状是圆圈,故C说法正确;纬线的长度都不相等,赤道是最长的纬线,向两极逐渐变短,到两极成为两点,故D说法错误。故选A

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