| |||
return pule | |||
pulse-echo | |||
echo impulse; echo pulse | |||
echo-pulse | |||
return pulse | |||
| |||
echo-pulse |
回波 脉冲 : 25 phrases in 10 subjects |
Air defense | 1 |
Aviation | 1 |
Earth sciences | 1 |
Electronics | 4 |
Metallurgy | 1 |
Oil / petroleum | 2 |
Plastics | 1 |
Space | 3 |
Technology | 8 |
Telecommunications | 3 |