• 2021-04-14
    环D的质量为m, OA=r,图示瞬时直角拐杆角速度为w,则该瞬时环的动能为_______http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/46d167239d1748ed9029623994d08e1b.png