問題詳情
⑵若改用實心的鋼軸，其重量會比中空管軸重多少或是輕多少？（請以百分比表示）另請解釋會這樣的原因為何？（10 分）
參考答案
答案：C
難度：適中0.594003
統計：A(346),B(639),C(2496),D(187),E(0)
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