GB/T 21956.1-2015
AbolishedProtective structure strength on narrow-track wheeled agricultural and forestry tractors—Testing method and acceptance condition—Part 1:Static testing method of front mounted ROPS
农林用窄轮距轮式拖拉机防护装置强度 试验方法和验收条件 第1部分:前置式静态试验方法