单选题:根据下列短文,回答题。Thanks to the help of this sonic device, blind pe 题目分类:理工类 题目类型:单选题 查看权限:VIP 题目内容: 根据下列短文,回答题。Thanks to the help of this sonic device, blind people can hear obstacles in the way speaking outtheir names. 参考答案: 答案解析:
________ when electron rearrangement takes place. ________ when electron rearrangement takes place. 分类:理工类 题型:单选题 查看答案