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Mr. Liu insists that the price of petrol _____ too high and that he ____ his car.
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If you are weak ____ a subject, ______your teacher for advice can help.
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A human ______ can do some things better than a computer, for example, creating new ideas.
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带电粒子M和N,先后以不同的速度沿PO方向射入圆形匀强磁场区域,运动轨迹如图所示。不计重力,下列分析正确的是( )
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