GB/T 21956.3-2008
农林窄轮距轮式拖拉机防护装置强度试验方法和验收条件.第3部分:后置式静态试验方法
The strength testing method and accepting condition of protective structures on narrow-track wheeled agricultural and forestry tractors.Part 3:Static testing method of rear mounted ROPS
GBT21956.3-2008, GB21956.3-2008