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一种对勘探钻孔内煤层气进行超前探测采样装置
Service Invention or Not:no
First Author:孙平贺等, 乌效鸣
Pre One:
金刚石放射状定位分布超薄层复合钻头及其制作工艺
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一种基坑三维变形的监测方法