近年来,经常考察美国市场的人士有一种感觉,原来美国大超市中MADE IN CHINA的商品占比在逐年减少,取而代之是其他发展中国家生产的同类商品,包括印度,泰国,越南和巴基斯坦等,这是差异化“比较优势”的体现,是市场经济中“看不见的手”在起作用。 比较成本理论是国际贸易分工的基础 英国古典经济学家大卫·李嘉图在亚当·斯密“绝对成本”理论的基础上,提出了比较成本(相对优势)理论,突破了绝
Chinese chestnut is an important nut tree around the world. Although the types of Chinese chestnut resources are abundant, resource utilization and protection o
Chinese cabbage (Brassica rapa subsp. pekinensis) suffers from soft rot disease caused by Pectobacterium carotovorum (Pc). To uncover the mechanisms underlying
AIM:To determine the expression of toll-like receptor 9(TLR9) in pancreatic tumor and the effects of cytosine phosphate-guanosine oligodeoxynucleotides 2216(CPG