偏微分方程，偏微分方程,pianweifen fangcheng，偏微分方程,pianweifen,fangcheng，[拼音]：pianweifen fangcheng[外文]：partial differential equation客观世界的物理量一般是随时间和空间位置而变化的，因而可以表达为时间坐标t和空间坐标(x1，x2，x3)...
双曲型偏微分方程，双曲型偏微分方程,shuangquxing pianweifen fangcheng，偏微分方程,双曲型,shuangquxing,fangcheng,pianweifen，[拼音]：shuangquxing pianweifen fangcheng[外文]：partial differential equation o...