... kilometres per hour 公里小时 kilometres per second 公里秒 kilometric scale 公里图尺 ...
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· king`s knight`s pawn (国际象棋中的)王翼马前兵 · kilometres per second 千米/秒,公里/秒 · =king`s rook (国际象棋中与王同列配置的)车 ..
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Eleven kilometres per second 每秒十一公里
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Light travels faster than sound at the speed of 300,000 kilometres per second.
光速比声速要快，为每秒钟30万公里。
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After millions of years in this position the new moon was drawn into a collision at a speed of less than three kilometres per second.
几百万年后，此状况下的新月亮以低于每秒3公里的速度要对撞了。
All of it is travelling at several kilometres per second - sufficient velocity for even the smallest fragment to do a lot of damage if it strikes an operational space mission.
BBC: UK design to 'harpoon' old satellites
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