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2．小芳乘超市的自动扶梯匀速下降的过程中小芳的机械能变化情况是 A．动能转化为重力势能机械能不变b．重力势能转化为动能机械能不变c Template






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sketch 5166 Jigsaw by Gisele Siqueira Zanni
sketch 3208 ELETR by Raimundo Santos
sketch 2309
sketch 3344 Homer by Samuel Roberto
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sketch 5047 Pikachu and Raichu by Saiful Farizam
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sketch 5207 Gorilla by Jean-Benoit Renaud
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sketch 1614 uncle bun
sketch 4566 Edward Scissorhands by Angel Ördoñez
sketch 3683 Hellboy by Loai Issa





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