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回波脉冲 | |||
脉冲反射波 | |||
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脉冲回波; 脉冲反射 |
pulse-echo : 33 phrases in 13 subjects |
Air defense | 1 |
Aviation | 1 |
Business | 2 |
Communications | 1 |
Earth sciences | 1 |
Electronics | 1 |
General | 1 |
Geophysics | 1 |
Metallurgy | 2 |
Oil / petroleum | 6 |
Space | 2 |
Technology | 10 |
Telecommunications | 4 |