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【题目】关于经线和纬线的正确叙述是:( )

A.所有经线的长度皆相等;B.所有经线都与本初子午线平行;

C.所有的经线圈和纬线圈都能平分地球;D.45°纬度的长度是0°纬线的一半。

【答案】A

【解析】

根据连接南北两极的线,叫经线。和经线相垂直的线,叫纬线。纬线是一条条长度不等的圆圈.最长的纬线,就是赤道;因为经线指示南北方向,所以,经线又叫子午线;国际上规定,把通过英国格林尼治天文台原址的那条经线,叫做0°经线,也叫本初子午线。在地球上经线指示南北方向,纬线指示东西方向,进行分析解答。

所有经线的长度皆相等,故A正确;

所有经线都相交于南北极点,故B不符合题意;

所有的经线圈和赤道都能平分地球,故C不符合题意;

60°纬度的长度是0°纬线的一半,故D不符合题意。

故选A

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