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求解，謝謝！！

12.5-8 P 9. [挑戰難題] .m/s。 有一螺絲釘,其螺距為d,而螺絲帽截面半徑亦為d,今在螺絲帽邊緣上 選定一點P,如右圖所示。則當旋進一時,P點之位移大小為 4 BE. (A)2d 螺絲帽平面上之位移 (B) √2d | 24 / 33 (C) 5√2d (D) -d V16 (E) d V16 0 d E
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