小朋友,留心周围,你会发现一些有趣的现象:课下玩丢沙包,有的同学反应敏捷,能轻快地躲开疾飞而来的沙包;骑车赶路,有的同学发现障碍物时反应却很迟钝,刹车缓慢,险些酿成事故……这就是人在反应能力上的差异。人的反应能力是能够测量的,除用秒表外,还有另一种方法, Children, pay attention to the surroundings, you will find some interesting phenomena: playing sandbags under the class, some students react agilely, can briskly escape the flying sandbags; ride hurry, some students find obstacles react Very slow, slow brakes, almost causing an accident ... This is the difference in human responsiveness. People’s ability to respond is able to measure, in addition to stopwatch, there is another way,