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来自全国各地、各兄弟部门的七十六名代表,于1981年10月28日至11月1日,在长沙举行了冲击-回转钻进技术专题报告讨论会。在会议上报告的论文有二十篇,着重讨论冲击-回
Seventy-six representatives from all parts of the country and various departments of the brothers held a symposium on special reports on impact-revolving drilling technology in Changsha from October 28 to November 1, 1981. Twenty papers were reported at the meeting, focusing on impact-back