China's mines are hoist AC Induction Motor Drive, and its electrical control system uses a rotor series, cutting speed resistance , by the relay - contactor control devices constitute a logical.

我国矿井提升绞车大多是采用交流异步电机拖动，其电气控制系统采用转子串、切电阻调速，由继电器-接触器构成逻辑控制装置。

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And what you will found is they will fall almost at the same speed, not exactly the same speed, because of air resistance.

他们原本会以同样的速度下落，但实际上并不是这样，因为空气中存在着阻力。

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The low-pressure area reduces wind resistance and hence the amount of drag, which means less energy is needed to maintain the same speed as the leader.

在低压力区，空气阻力减少，向后拉的力量减小，因此只需要消耗较少的能量就可维持与在前面的竞争对手相同的速度。

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Mr Haldane uses the analogy of dogs, such as border collies, which are very reliable catchers of Frisbees without being aware of the complex calculations (wind speed, air resistance, etc) that might be involved.

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Other adapters can do some of that, but its final trick is the piece de resistance: increasing the speed of a lens by a full stop.

ENGADGET

"There was a little bit of resistance at first when they talked about speed reductions, " he said.

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