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地质图空间数据库建设工作指南 - cgs.gov.cn识别码采用字符,取属性表主要含义的一个汉语拼音的首字母。如1:50000将军庙幅地质图中 地层图层有地层界线和地层单位二种属性表,分别取界线(j)、地层(d),
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