介绍了煤矿企业的现状及引入招标机制的必要性，从而提高了工程技术改造的成功率，节省了资金。
The state of coal enterprise and necessity of joining bids system are introduced. It can increase the success rate in the engineering technology reform and save money.
目的为了缩短颌骨牵张成骨技术的治疗时间，改善新骨形成的质量，从而提高牵张成骨技术的成功率。
Aim in order to reduce the mandibular distraction osteogenesis treatment time and improve the quality of new generated bone, enhancing its success rate.
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