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period control | |||
periodical control |
周期控制: 30 phrases in 14 subjects |
Agriculture | 1 |
Aviation | 3 |
Computer networks | 1 |
Electronics | 6 |
General | 2 |
Genetics | 2 |
Metallurgy | 1 |
Nursing | 1 |
Plastics | 2 |
Project management | 1 |
Radio | 1 |
Shipbuilding | 1 |
Space | 4 |
Technology | 4 |