最佳答案:hi everyone,thank you for your coming.........finally i hope your children can g
最佳答案:一球由两根线固定静止在A点,当水平那根线切断后,球开始摆动.B点是球右摆的最远点.问,当球运动到B时支持绳受力和切断水平那根线前球静止在A点时的比例是多少(这个
最佳答案:上面的翻译存在错误,正确翻译是:Perhaps we may not be together in the end,but i hope that we sha