The equivalent model has good applicability for strong nonlinear Duffing systems.该等效模型对强非线性杜芬系统具有良好的适用性.This paper deals with analytical approximate solutions to the Duffing - Harmonic oscillator by a new method.用一种新方法研究...
Skin can be preserved viably at 20℃ for 45 dyas but not longer than 60 days.作者认为应用本方法储存的皮肤应在45天内用完,最长不要超过60天.It passes mainly through the purple -- color soft sandrock and mudstone in Triassic or Dyas Systems.隧道主要通过三迭系、二...