论文部分内容阅读
编辑同志:我们驾驶铁牛—55型拖拉机牵引装有六,七吨货物的拖车,用四档速度在山路下坡段行驶中,发生了活塞顶气门事故。据说邻村的拖拉机也发生过类似的事故。请问这是由什么原因引起的?刘延庆李房山
Editor’s Comrade: We piloted the Tractor-55 tractor to pull the trailer with six or seven tons of cargo and used the fourth speed to drive the downhill section of the mountain road. A piston top valve accident occurred. It is said that a similar accident happened in tractors in neighboring villages. May I ask what is caused by what? Liu Yanqing Li Fangshan