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一套三根用于自由落体仪的安全试验导线
毫秒计数器 (115 V, 50/60 Hz)
毫秒计数器（230 V，50/60 Hz）
Set of 3 Steel Balls
Holder for Light Barrier
光控计时门
数字计数器（230 V, 50/60 HZ）
自由落体实验装置(230 V, 50/60 Hz)
Experiment: Free Fall (115 V, 50/60 Hz)
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