It was applied to speed control ind-c motor and obvious effect has been found.

该方法已应用到直流电动机的调速上，并取得了满意的效果。

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It has been found that smoking does have an effect on the health of smokers.

已发现吸烟对吸烟者的健康确实有影响。

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It has been found that smoking does have an effect on the health of smokers.

已发现吸烟对吸烟者的健康确实有影响。

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