研发（R&D）注意事项 / 复杂项目规划、控制方法 PERT 和 CPM注：机翻，未校对，去掉了原文中广告。Investopedia / Ellen LindnerResearch and Development An ongoing effort to develop or improve products and services, often undertaken by teams of highly skilled scientists and engineers. 开发或改进产品和服务的持续努力，通常由高技能科学家和工程师团队承担。