duplex : 56 phrases in 13 subjects |
Communications | 18 |
Earth sciences | 1 |
Electronics | 7 |
Industry | 2 |
Information technology | 4 |
Materials science | 5 |
Mechanic engineering | 3 |
Medical | 1 |
Metallurgy | 3 |
Microsoft | 2 |
Statistics | 1 |
Technology | 3 |
Telegraphy | 6 |