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1·Objective To discuss the advantage in clinical effect of traction treatment on children femoral shaf fracture.

目的探讨牵引治疗儿童股骨干骨折的临床疗效与优越性。

2·The optimal protection for bearing current was reached by the insulation of both ends of bearing and grounding of carbon brush of motor shaf…

电机双端轴承绝缘并且电机轴碳刷接地，可构成对轴承电流的最佳防护。

3·Therefore the design criterion for the shaft is proposed, i. e. the fatigue strength of the shaf should depend on the torsional fatigue strength.

挠性轴强度校核主要是校核疲劳强度，为此提出了合理设计挠性轴的原则，即挠性轴的疲劳强度应取决于扭转疲劳强度。