PEST模型
参考答案:
指利用政治法律、经济、社会文化、技术等因素分析企业外部宏观环境的模型。
Why don’t you put the meat in the fridge? It will ________ fresh for several days.
A.be stayed
B.stay
C.be staying
D.have stayed
继电保护装置的试验分为几种?