怎么能让一个物体在空中平稳下降?材料是 棉线许多根,两张可透风的彩纸,质量介于纸和纱布之间.150ML的矿泉水瓶,可以随意剪裁成任何形状做太空舱,然后用鸡蛋当宇航员放里面.还有6个可吹
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/16 12:51:31
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