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() 2. A range finder is shown by the following picture? The elapsed time of its wave is 100 ms. What's the distance from

() 2. A range finder is shown by the following picture? The elapsed time of its wave is 100 ms. What's the distance from station A to station B? (Suppose the speed of wave propagation is 340 m/s) B A. 17 cm . 34 . 17 m D. 34 m

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