Section one will explain the problems of scarcity and choice, the concept of opportunity cost and the difference between micro and macro economics.
第一节解释了稀缺性和选择的问题，机会成本的概念和微观与宏观经济学的区别。
The flow controlling section has a good performance and applicability, this section can also be used in other micro flow controlling application without great changes.
流路测控部分性能好，适应性强，并且可以应用到其它微流控方面的研究中去。
A kind of intelligence micro-tension control system has been studied to especially improve the control precision of tension between stands for complicated section continuous rolling.
为提高型钢尤其是复杂断面型钢连轧时机架间张力的控制精度，研究了一种智能化微张力控制系统。
应用推荐