| |||
| 系统层次结构 | |||
|
system hierarchy : 13 phrases in 7 subjects |
| Business | 3 |
| Electronics | 1 |
| Hydroelectric power stations | 1 |
| Information technology | 1 |
| Mathematics | 1 |
| Oil / petroleum | 1 |
| Technology | 5 |
| |||
| 系统层次结构 | |||
|
system hierarchy : 13 phrases in 7 subjects |
| Business | 3 |
| Electronics | 1 |
| Hydroelectric power stations | 1 |
| Information technology | 1 |
| Mathematics | 1 |
| Oil / petroleum | 1 |
| Technology | 5 |