定级2种模式 1 成本加权定价 2 目标利润定价
https://mp.weixin.qq.com/s?__biz=MzI0OTE2MjQ2OA==&mid=2650115214&idx=1&sn=45b53d277e2e85e41a5828d189db224f&chksm=f0fda6dfc5d6ba8e3b3638086634f78a208dd4c9c0c0ec55af999426355f93654af05cedf4bf#rd