里面怎么没有ABCD的选项 那个columnA和B又是什么意思啊 我想做数学来着 可是苦于看不懂 所以 相关知识点: 试题来源: 解析 我到有一题:the reflection of a positive integer is obtained by reversing its digits.for ex.321 is the reflection of 123.the difference between a five-digit integer and its ...