GB/T 21956.3-2015
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3部分:后置式静态试验方法
Strength test methods and acceptance conditions for protective devices of narrow-track wheeled tractors for agriculture and forestry - Part 3: Rear-mounted static test methods
GBT21956.3-2015, GB21956.3-2015