voice distress switch box的意思|示意

语音遇险开关箱 ... voice distress switch box 音响呼救开关盒 voice distress switch box 语音遇险开关箱 voice distress switch box 语音遇险开关箱音响呼救开关盒 ...

音响呼救开关盒 ... voice communication 话音通信 voice distress switch box 音响呼救开关盒 voice distress switch box 语音遇险开关箱 ...

语音遇险开关箱音响呼救开关盒 voice distress switch box 语音遇险开关箱音响呼救开关盒 voice frequency carrier telegraph 音频载波电报 ..