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這一題要怎麼算啊?
急~~
,答陋大的次隊8
(25 如購所示,三個直徑相同且質量均為20kg的圓球、 置於一八革的容計
艾為光沸面,則接鵬點A的反作用力約為多少N9(茶反力/芙點力休/還和
G75 (GB)118 (C)226 (Ds88
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