三种选择排序法，每一趟在n-i+1(i=1，2，…n-1)个记录中选取关键字最小的记录作为有序序列中第i个记录(Three alternative sorting methods, each in n-i+1 (i=1, 2),... (n-1) the minimum record of the keyword selected in the record is used as the I record in the ordered sequence)