School work can't think out ask you PLS help me

CodePudding user response:

Layered model is common in our daily life, the typical logistics system, the company's notice, approval, coordination system

CodePudding user response:

references reply 1/f, perception of beginner's mind:

layered model is common in our daily life, the typical logistics system, the company's notice, the examination and approval, coordination system

thanks brother