The paper introduced a method that can locate the position of cable breaking point by using the reflection of low pressure impulse, and set up a control system through 89c52.
介绍了一种利用低压脉冲反射法测定电缆断点位置的方法，并采用89c52单片机建立了控制系统。
2
To reasonably control the ball, the players must reasonably choose attacking position, attacking time and attacking point.
合理控制球的技法，则必须合理选择击球位置、击球时机和击球点；
3
Starting from the energy principle and regarding the minimum strain energy as control condition, we get the best position design of the hanging point.