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假设实心球体在空中下落时受到空气阻力大小正比球体半径与球体速度的乘积．现有实心木球甲乙和实心铁球丙从高空由静止下落如图所示三球的半径关系 Template






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sketch 519 The Joker
sketch 4091 Irie
sketch 3431 Jimi Hendrix by Konvicted Rohit
sketch 4582 Pikachu by Mariana Sanchez Acevedo
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sketch 2884 Robot Shimun Yeyo Ahmed
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tomski假设实心球体在空中下落时受到空气阻力大小正比球体半径与球体速度的乘积．现有实心木球甲乙和实心铁球丙从高空由静止下落如图所示三球的半径关系 coloring
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