20/80规则和什么相关？（）

什么是风险的拥有者？ （）

项目经理了解到一项变更请求已获批准，这项变更将影响到项目成本和项目进度。项目经理应该怎么做

The project manager feels the meeting with very poor results.The participants are not well prepared,fail to conform to the agenda.What should the project manager change the attitude of the project trea？

运营和维护工作().