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Try and sketch some of theseChest, Nun, Skydiver, Train, Ice cream sandwich, Hula hoop, Sailboat, Steak, Spaghetti, Snowmobile, view more ideas


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tomski如图所示物体m放在斜面上恰好沿斜面匀速下�而斜面体静止现用一个力f作用在m上f过m的重心且竖直�下则 a地面对斜面的�擦 coloring