An interesting image. It shows PLZ05s firing from a valley road. The high firing angle and the mountainous surroundings indicate probable indirect fire, aiming for targets on the other side of the mountains.
Long range rocket artillery demolishing towed artillery formation at 5KM altitude. The only way to fire accurately at high altitude is to shoot plenty of munitions and acquire the necessary data for weapons calibration. Looks like harde earned data from last year’s military exercises has paid off.