长江干流地区横跨我国东、中、西三大经济地带,经济发展既有共性,也存在梯级差异。处在长江口的上海是我国最大的工业和经济中心,并正在进一步发展成为远东地区经济、金融、贸易中心之一;长江三角洲是我国综合经济实力较强的地区之一,外向型经济发展和产业经济技术均已达到一定的水 The mainstream of the Yangtze River runs across the three major economic zones of East, Central and Western China. Economic development has both commonalities and differences in steps. Shanghai, located in the mouth of the Yangtze River, is China’s largest industrial and economic center and is further developing into one of the economic, financial and trade centers in the Far East. The Yangtze River Delta is one of the regions with strong comprehensive economic strength in our country. The development of an outward-oriented economy and Industrial economic and technological have reached a certain level of water