（2）　　激光枪固定在一机构上，可通过键盘控制激光枪的弹着点（用键盘设置激光束在靶纸上上下、左右移动一定距离-(2) fixed to a laser gun mechanism, a laser gun can be controlled by the keyboard of the point of impact (using the keyboard provided in the target of the laser beam up and down the paper, move around a predetermined distance