2. 外语
  3. ______is the speed at which something moves in a particular direction.

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

admin2015-04-29  11
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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