This paper by use of perturbation method found asymptotic periodic solution of piston stroke, and found rational periodic for periodic external force.
本文用摄动方法求得了活塞行程的渐近周期解，且为周期性外力求出合理的周期。
Methods: The pigskin was treated with CSTHC solution before allogeneic transplantation, and CSTHC ointment was applied for external use on the grafted pigskin after skin transplantation.
方法：采用CSTHC水煎剂浸泡孵化供体猪皮片，然后进行皮片移植，局部外涂CSTHC软膏。
Methods: The pigskin was treated with CSTHC solution before allogeneic transplantation, and CSTHC ointment was applied for external use on the grafted pigskin after skin transplantation.
方法：采用CSTHC水煎剂浸泡孵化供体猪皮片，然后进行皮片移植，局部外涂CSTHC软膏。
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