下图中a为极圈内一纬线圈虚线为晨昏线b点为极圈与晨昏线的交点读图完成下题当a纬线圈上昼弧与夜弧的差值不断扩大时则a.b点始终�西移动 Template




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tomski下图中a为极圈内一纬线圈虚线为晨昏线b点为极圈与晨昏线的交点读图完成下题当a纬线圈上昼弧与夜弧的差值不断扩大时则a.b点始终�西移动 coloring