______is the speed at which something moves in a particular direction.A、Voltage

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问题 ______is the speed at which something moves in a particular direction.

选项 A、Voltage
B、Velocity
C、Proportion
D、Frequency

答案 B

解析名词辨析题。velocity意为“速率”，符合句意，故[B]为答案。voltage意为“电压”；proportion意为“比例；面积”；frequency意为“频率”。

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