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一种基坑三维变形的监测方法
Service Invention or Not:no
First Author:孙平贺等, 赵自亮
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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
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一种适用于深部钻探破碎地层固结护壁钻井液及其制备方法