The solutions of interal form and the general solutions of some second order homogeneous linear differential equations with variable coefficient are given.
给出了变系数二阶齐次线性常微分方程的一种积分形式解和几类变系数二阶齐线性常微分方程的普遍解。
The reasons of internal fixation failure were nonanatomically reduction of fractures, unrigid interal fixation, over early weight bearing and poor placement of lag screw.
内固定失败原因是术中骨折未解剖复位、内固定不坚强、过早完全负重以及拉力螺钉位置不良。
The present paper makes analysis of false wiring of residual current operated circuit-breaker with interal overcurrent protection based on its operation principle in combination with related code.
试从原理入手并结合相关规范，对带过流保护的剩余电流动作断路器误接线进行分析。
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