Question

與120°W經(jīng)線共同組成經(jīng)線圈的另一條經(jīng)線的經(jīng)度是（　�。�

A．60°E

B．60°W

C．120°E

D．0°

Answer 1

經(jīng)線的形狀是半圓，每條經(jīng)線與它相對(duì)的經(jīng)線組成一個(gè)經(jīng)線圈，其度數(shù)和為180°，東西經(jīng)度相反（0°經(jīng)線和180°經(jīng)線相反）．
A、與東經(jīng)60°相對(duì)的經(jīng)線的度數(shù)為西經(jīng)120°，故符合題意
B、與西經(jīng)60°相對(duì)的經(jīng)線的度數(shù)為東經(jīng)120°，故不符合題意
C、與東經(jīng)120°相對(duì)的經(jīng)線的度數(shù)為西經(jīng)60°，故不符合題意
D、與0°經(jīng)線相對(duì)的經(jīng)線的度數(shù)為180°，故不符合題意
故選：A．