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微妙计数器(230 V, 50/60 Hz)
微妙计数器(115 V, 50/60 Hz)
麦克风盒(230 V, 50/60 Hz)
麦克风盒(115 V, 50/60 Hz)
昆特管E
Experiment: Speed of sound in air (115 V, 50/60 Hz)
Experiment: Speed of sound in air (230 V, 50/60 Hz)
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