某圓形截面的鋼製桿件，直徑為 d，則相對應於截面慣性矩之旋轉半徑(radius of gyration)為何？(A) d/4 (B) d/2 (C) 2d (D) d/6

問題詳情

15.某圓形截面的鋼製桿件，直徑為 d，則相對應於截面慣性矩之旋轉半徑(radius of gyration)為何？
(A) d/4
(B) d/2
(C) 2d
(D) d/6

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