摘要： 1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 6 namespace ClassLibrary1.MyTest 7 { 8 /// <summary> 9 /// 运算类10 /// </summary>11 public abstract class Operation12 {13 /// <summary>14 /// 初始化属性15 /// </summ... 阅读全文