根据观察所指令装定射击诸元。
Artillerymen assigned to a brigade under the PLA 77th Group Army prepare a vehicle-mounted rocket launcher system during a round-the-clock live-fire training exercise on southwest China's Western Sichuan Plateau from August 8 to 11, 2018. (eng.chinamil.com.cn/Photo by Hu Jing, Li Chengde and Sun Zhenqi)
