【題目】下面有關(guān)經(jīng)線和緯線的說法正確的是( 。
A.每條經(jīng)線的長度都是相等的B.經(jīng)線與經(jīng)線之間是相互平行的
C.經(jīng)線和緯線的形狀都是一個圓D.每條緯線的長度都是相等的
【答案】A
【解析】
經(jīng)線是連接南北兩極并同緯線垂直相交的半圓,也稱子午線,經(jīng)線指示南北方向;所有經(jīng)線都呈半圓狀且長度相等;兩條正相對的經(jīng)線形成一個經(jīng)線圈;任何一個經(jīng)線圈都能把地球平分為兩個半球。緯線是在地球儀上,順著東西方向,環(huán)繞地球儀一周的圓圈。所有的緯線都相互平行,并與經(jīng)線垂直,緯線指示東西方向。緯線圈的大小不等,赤道為最大的緯線圈,從赤道向兩極緯線圈逐漸縮小,到南、北兩極縮小為點(diǎn)。
經(jīng)線是連接南北兩極的半圓,每條經(jīng)線的長度都是相等的,故A說法正確;經(jīng)線與經(jīng)線之間是垂直相交的,故B說法錯誤;經(jīng)線的形狀為半圓,緯線的形狀是圓圈,故C說法正確;緯線的長度都不相等,赤道是最長的緯線,向兩極逐漸變短,到兩極成為兩點(diǎn),故D說法錯誤。故選A
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