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某学生在体育场上抛出铅球其运动轨迹如图所示．已知在b点时的速度与加速度相互垂直则下列说法中正确的是 A．d点的速率比c点的速率大b．d Template






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sketch 2668 Butterfly by Loai Issa
sketch 5137 Happy Halloween! by Guillaume Ballieu
sketch 4424 MJ by Nycole Prietsch
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sketch 4386 Freddie Mercury by Павел Павлов

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