摘要: 题目如下: 解题思路:本题题目中有一点要求很关键,“we will consider that a falling domino expends no additional force to a falling or already fallen domino.”,正好对应题目中的例子2,要好好理解 阅读全文
posted @ 2018-05-22 11:19 seyjs 阅读(1162) 评论(0) 推荐(0) 编辑