一、美国各级政府的优惠政策只给贫困地区,有利于缩小地区间的差距。 二、联邦投资的区域开发项目,免除一切税收,利润留当地滚动发展,有利于 First, the preferential policies of the U.S. governments at all levels only give impoverished areas and are conducive to narrowing the gap between regions. Second, the federal investment in regional development projects, all tax exemption, profit left the local rolling development, is conducive to