- octave phono amplifier
- 倍频: frequency doubling; frequenc ...
- 心音: heart sounds; cardiac sounds ...
- 放大器: amplifier; pantograph; lawnm ...
- 心音放大器: cardio-amplifier; heart sound amplifier; heart sound microphone; phonocardiograph amplifier
- 马-韦二氏心音放大器: maass-weber phono amplifier
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