自上而下选用框架具有质量高，框架完善容易，思考速度快等特点，它是先收敛再发散的过程。目的是找一个完整结构，然后围绕结构做“问题细化”。 To provide the top activities, we use systems like cookies to retail store and/or obtain machine data. Consenting to those technologies allows us to system facts for instance searching conduct or special IDs on This website. Not consenting or withdrawing... https://experiment.com/users/ggodovietnam