GB/T 21956.2-2008
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2部分:前置式动态试验方法
The strength testing method and accepting condition of protective structures on narrow-track wheeled agricultural and forestry tractors.Part 2:Dynamic testing method of front mounted ROPS
GBT21956.2-2008, GB21956.2-2008