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| primary clock; master clock; mother clock | |||
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| main clock; master clock | |||
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主钟 : 35 phrases in 13 subjects |
| Aviation | 1 |
| Communications | 1 |
| Electronics | 4 |
| General | 3 |
| Geophysics | 1 |
| Information technology | 5 |
| Metallurgy | 1 |
| Nautical | 1 |
| Oil / petroleum | 1 |
| Project management | 1 |
| Shipbuilding | 4 |
| Technology | 8 |
| Telecommunications | 4 |
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