| |||
characteristic time |
特征时间 : 16 phrases in 11 subjects |
Athletics | 1 |
Aviation | 1 |
Business | 2 |
Communications | 1 |
Desert science | 2 |
Electronics | 1 |
Explosives and Explosive Ordnance Disposal | 1 |
Oil / petroleum | 1 |
Space | 3 |
Technology | 2 |
Telecommunications | 1 |