燕山地区冀北坳陷雾迷山组硅质岩特征研究——以辽宁省凌源县魏杖子剖面为例
연산지구기북요함무미산조규질암특정연구——이요녕성릉원현위장자부면위례
Study on characteristics of siliceous rock in Wumisnan group, Jibei sagi Yanshan area
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