python统计字母个数s='''Five score years ago, a great American, in who symbolic shadow we stand today, signed the Emancipation Proclamation. This momentous decree came as a great beacon light of hope to mi
05Cloze (10 points) Until recently most historians spoke very critically of the Industrial Revolution. They ______ that in the long run industrialization greatly raid the standard of living fo
筑龙网W W W .Z H U L O N G .C O M万能式低压主断路器、塑料外壳式断路器设计选型北京市住宅建筑设计研究院 朱林根一、 设备选型技术导向（一） 概述低压断路器，原名空气开关、自动开关，现与IEC 等同，国家统一命名为低压断路器系列产品。从20世纪50年代以来经过全面仿苏、自行设计、更新换代和技术引进以及合资生产等几个阶段，低压断路器国产制造能力大容量额定电流可以生产到5000
