城镇化水平是衡量一个国家或地区城镇化发展的重要指标,通常以居住在城镇的人口占总人口的比例来表示。1949～1977年,东北三省城市数量较多,大中城市高度密集,是当时全国城市化程度最 The level of urbanization is an important indicator of the urbanization in a country or region. It is usually expressed as the ratio of the population living in urban areas to the total population. From 1949 to 1977, the number of cities in the three northeastern provinces was large, and the large and medium-sized cities were highly dense. At that time, the urbanization degree in the country was the highest