前不久，我和一位三包服务人员到用户那儿去处理拖拉机故障。故障处理完后，在饭后茶余之闲，机手给我们讲述了一起真切且悲痛的事故。事情是这样的：近村有一位驾驶员，从市里拉一车货返程回家，在途中的一个下坡路段上，突然车轮子脱下来飞了出去。在这紧急关头，当他紧急刹 Not long ago, I went to the user with a three-man service crew to deal with tractor failure. After troubleshooting, after dinner Chayu leisure, the hand told us about a real and sad accident. Things like this: There is a driver near the village, pulling a car from the city to return home, on the way downhill, suddenly the wheels off and fly out. At this critical moment, when he emergency brake