PG20型铺轨车
PG20 type track laying car
精调仰角自动同步传送机
fine elevation-transmitting selsyn
精调距离自动同步传送机
fine range-transmitting selsyn
精调技术
fine-tuning technology
precise positioning technique
fine adjustment technology
精调方位角自动同步传送机
fine azimuth-transmitting selsyn
精调Stewart平台
Fine tuning Stewart platform
粗精调
coarse and accurate adjustment
长钢轨精调
long rail track accurate adjustment