NOx
| System
| Nox | |
| phys. | nox |
| System | |
| gen. | system |
| busin. | framework |
| comp. | system software |
| earth.sc. mech.eng. | system |
| IMF. | scheme |
| refrig. | system; thermodynamic system |
| social.sc. | drug addiction |
| tech. | method; plan |
| |||
| nox | |||
|
NOx : 12 phrases in 5 subjects |
| Coal | 3 |
| Environment | 6 |
| General | 1 |
| Natural resourses and wildlife conservation | 1 |
| Natural sciences | 1 |