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一、用图说话1.葡萄熟了,从葡萄架上落下来,下列图象可以大致反映葡萄下落过程中速度v随时间t变化情况的是( )
First, use the map to speak 1. Grapes are ripe, fall from the grape rack, the following images can generally reflect the speed v of grapes falling process changes with time t is ()