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分别用定�轮动�轮�轮组把同一个物体匀速提升到同一高度其中机械效率最高的是a．定�轮b．动�轮c．�轮组d．无法确定 题目和参考答案 Template






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sketch 2788 Yuno Gasai from Mirai Nikki by Cristina Love
sketch 2640 Marge by Mirnes Sinanovic
sketch 5149 Daenerys Targaryen by Jorge Valero
sketch 5071 Rihanna by Johan Kennet Espinoza Moreno
sketch 5100 Shadow by An Nguyen
sketch 2072
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sketch 3247 Thor by Juvenilia Alexandrino
sketch 937
sketch 5039
sketch 3151 Spaceship Nessa Kira Hellsing
sketch 2892 Joker by Frank Aguiar Au
sketch 4190
sketch 334 DON 'T!
sketch 4053





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