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单选题
设有不同基准比例尺的两张墨卡托海图，则两图上同一纬度线到赤道的子午线图长的关系为（MP为该纬度的纬度渐长率）（）。
A
两者相等
B
两者不等
C
均为MP×1＇经度的图长
D
B、C均正确
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