下图中ab线表示晨昏圈的一部分此时地球公转速度较快读图判断若此后一个月内图示交角逐渐增大则这一段时期北京的昼夜长短及其变化趋势是a.昼 Template




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tomski下图中ab线表示晨昏圈的一部分此时地球公转速度较快读图判断若此后一个月内图示交角逐渐增大则这一段时期北京的昼夜长短及其变化趋势是a.昼 coloring