采用特殊的柱面单元及算法计算油井套管表面的电位分布，节约了机时，缩短了计算周期。
In this paper, the special cylindrical element method is discussed in calculating oil well case potential distribution to shorten computer operation time.
结论呼吸功能训练辅助治疗吸入性损伤可缩短气管套管留置时间，改善患者肺功能。
Conclusion Respiratory function training can shorten the removing time of tracheal tube, improve the pulmonary function and decease the pulmonary infection rate.
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