Question

與西經(jīng)120゜經(jīng)線(xiàn)共同組成經(jīng)線(xiàn)圈的另一條經(jīng)線(xiàn)的經(jīng)度是（　�。�

A．西經(jīng)160°

B．東經(jīng)120°

C．東經(jīng)60°

D．0°經(jīng)線(xiàn)

Answer 1

經(jīng)線(xiàn)的形狀是半圓，每條經(jīng)線(xiàn)與它相對(duì)的經(jīng)線(xiàn)組成一個(gè)經(jīng)線(xiàn)圈，其度數(shù)和為180°，東西經(jīng)度相反（0°經(jīng)線(xiàn)和180°經(jīng)線(xiàn)相反）．
A、與西經(jīng)160°相對(duì)的經(jīng)線(xiàn)的度數(shù)為東經(jīng)20°，故不符合題意
B、與東經(jīng)120°相對(duì)的經(jīng)線(xiàn)的度數(shù)為西經(jīng)60°，故不符合題意
C、與東經(jīng)60°相對(duì)的經(jīng)線(xiàn)的度數(shù)為西經(jīng)120°，故符合題意
D、與0°經(jīng)線(xiàn)相對(duì)的經(jīng)線(xiàn)的度數(shù)為180°，故不符合題意
故選：C．