controlled source | |
el. | 受控源 |
el.mach. | 受控电源 |
audio frequency | |
commun. | 声频 |
IT | 音频; 声频 |
phys. | 成音频率 |
radio.amat. | 音频 |
tech. | 声响频率; 成声频率 |
method | |
environ. | 方法 |
controlled source audio frequency: 5 phrases in 4 subjects |
Earth sciences | 2 |
Geophysics | 1 |
Hydroelectric power stations | 1 |
Oil / petroleum | 1 |