(?)5m×15m闭路水泥粉磨系统
closed circuitφ5m×15m cement mill system
(+)电子经纬仪测量系统
Electron-theodolite surveying syste
(2+1)维Hybrid-Lattice系统
2+1)-dimensional Hybrid-Lattice
(2+1)维变系数色散长波系统
2+1)-dimensional dispersive long wave system with variable coefficient
(2+1)维非对称Nizhnik-Novikov-Veselov系统
(3+1)维Burgers系统
3+1)-dimensional Burgers system
(符号略)公里系统
The symbol is abbreviated) axiom system
．n中取连续n一1好系统
consecutive-(n-1)-out-of-n(G) system
\污水渗滤土地处理系统
Wastewater Infiltration land Treating Systems