平均速度average speed;average velocity;mean velocity详细»
平均速度average speed;average velocity;averaged velocity;mean velocity详细»
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平均速度average speed;mean velocity详细»
平均速度average speed;mean velocity;average velocity详细»
平均速度mean velocity;meanvelocity详细»
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平均速度average speed;mean velocity;average velocity详细»
平均速度average velocity;mean velocity详细»