下图为“甲乙两个地区的人口年龄组成示意图 若甲地区的人口自然增长率为a乙地区的人口自然增长率为b那么a与b的数量关系是 A.a Template




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tomski下图为“甲乙两个地区的人口年龄组成示意图 若甲地区的人口自然增长率为a乙地区的人口自然增长率为b那么a与b的数量关系是 a.a coloring