【題目】關(guān)于經(jīng)線和緯線敘述正確的是( )

A. 所有經(jīng)線都相互平行B. 緯度越低,緯線越長(zhǎng)

C. 經(jīng)線和緯線的長(zhǎng)度相等D. 緯線指示南北方向

【答案】B

【解析】

根據(jù)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(zhǎng)度相等;兩條正相對(duì)的經(jīng)線形成一個(gè)經(jīng)線圈;任何一個(gè)經(jīng)線圈都能把地球平分為兩個(gè)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),進(jìn)行分析解答。

經(jīng)線是連接南北兩極并同緯線垂直相交的半圓,所有經(jīng)線都與本初子午線相交于南北兩極,故A錯(cuò)誤;

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),故B正確;

每條經(jīng)線的長(zhǎng)度都相等,每條緯線的長(zhǎng)度不相等(相同緯度的除外),故C錯(cuò)誤;

經(jīng)線指示南北方向;緯線指示東西方向;故D錯(cuò)誤。

故選:B。

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