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time history | |||
history | |||
time curve |
时间关系 曲线 : 24 phrases in 10 subjects |
Aviation | 1 |
Bridge construction | 2 |
Electric machinery | 1 |
Electronics | 3 |
Explosives and Explosive Ordnance Disposal | 2 |
General | 1 |
Geophysics | 1 |
Metallurgy | 4 |
Oil / petroleum | 2 |
Technology | 7 |