最高阶导数线性地出现的那种方程是准线性方程.A quasilinear equation is one in which the highest - order derivative appears linearly.这种 “ 导数边界条件 ” 的规定描述于 3-5 节中.The specification of such " derivative boundary conditions " is described in Sectio...
I have the fingernail clippers.我有指甲钳.Six weeks after conception your baby is the size of your little fingernail.怀孕6个星期后，胎儿的大小相当于小拇指的指甲。Melanie gnawed a long, painted fingernail.梅拉妮咬着涂过指甲油的长指甲。...