Different frequency control technology  转差频率控制

Frequency control technology  变频调速技术

active sound control  有源消声

ecologically sound technology  生态无害技术

Environmentally sound technology  环境无害的技术

EST(Environmentally-sound technology)  环保型技术

Filtered Sound Frequency  滤波频率

Frequency Sound ing  频率测深

high-frequency sound field  高频声场

low-frequency sound absorption  低频吸声

low-frequency sound insulation  低频隔音

low-frequency sound wave  低频声波

sound control  声音控制; 音响控制

SOUND CONTROL BOARD  音响控制台

sound frequency  音频; 声波频率; 声频

sound frequency electric current  音频电

Sound frequency therapy  音频电

sound frequency vibration  声波振动

sound-frequency  声频