目的：探讨腹腔镜胆囊切除术（LC）手术的难度分级方法及原因。
Objective:To explore the methods and reasons of the difficulty classification in laparoscopic cholecystectomy(LC).
TK 908dh井是目前国内完成最深的双分支井，施工难度达到国际分级标准TAML 4级。
TK908DH well was an deepest well with dual lateral, and the difficulty of drilling run up to international grade scale TAML4 level.
实际仿真研究表明，该方法能够提高生产效率，解决磨矿过程中有一定难度的溢流浓度和分级粒度控制问题。
Practical simulation and research show that the production efficiency of the milling system is increased, and the overflowing concentration and size grading control are satis…
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