【多选题】5 / 10长波的基本方程组为A∂u∂t=−g∂ζ∂x\frac{\partial u}{\partial t}=-g\frac{\partial\zeta}{\partial x}∂t∂u=−g∂x∂ζ正确B∂ζ∂t=−∂(hu)∂x\frac{\partial\zeta}{\partial t}=-\frac{\partial(hu)}{\partial x}∂t∂ζ=−∂x∂(hu)正确C∂u∂t=−g∂h∂x\frac{\partial u}{\partial t}=-g\frac{\partial h}{\partial x}∂t∂u=−g∂x∂hD∂ζ∂t=∂(hu)∂x\frac{\partial\zeta}{\partial t}=\frac{\partial(hu)}{\partial x}∂t∂ζ=∂x∂(hu)参考答案A、B参考解析∂u/∂t=−g ∂ζ/∂x\partial u/\partial t=-g\,\partial\zeta/\partial x∂u/∂t=−g∂ζ/∂x，∂ζ/∂t=−∂(hu)/∂x\partial\zeta/\partial t=-\partial(hu)/\partial x∂ζ/∂t=−∂(hu)/∂x（K8−25K8-25K8−25）。
