什么是primary demand he secondary demand?primary demand expansion effect of promotion如何解释?

什么是primary demand he secondary demand?primary demand expansion effect of promotion如何解释? 什么是aggregate demand请问有谁知道什么是Aggregate demand?谢谢 He will finishes primary school. Demand demand primary primary primary primary he studies in xinhua road primary he （ ）at Jingling primary School 什么是primary data和secondary data? 请专家们解释一下什么是ON-DEMAND和on-premise 英语翻译什么是demand the right?right 是权利还是正义? teaches,in ,english ,a ,school ,primary ,he,连词成句众位亲们, How did he learn in primary school?怎么回答 Li Hua is a primary school student and he enjoys he is the __engineer in the factorymain major chief primary