有一个直角支架AOB,A0水平放置,A0上套有小环P,OB上套有小环Q,两环质量均为m,两环间由一根质量可忽略、不可伸长 有一个直角支架AOB,A0水平放置,A0上套有小环P,OB上套有小环Q,两环质量均为m,两环间由一根质量可忽略、不可伸长的细绳相连,并在某一位置平衡(如图),现 分类:理工类 题型:单选题 查看答案
The little known George Mason University was a dark horse be The little known George Mason University was a dark horse because. 分类:理工类 题型:单选题 查看答案