39. 圖(十二)中a、b、c桿件之材料彈性模數(Elastic Modulus)為E、斷面積為A, a、c 桿件長度為b桿件的二倍,則a、b、c三根桿件所受到的拉力分別為:
(A) a 桿拉力=P、b 桿拉力=P、c 桿拉力=P
(B) a 桿拉力=\(\frac{P}{3}\)、b 桿拉力=\(\frac{P}{3}\)、c 桿拉力=\(\frac{P}{3}\)
(C) a 桿拉力=\(\frac{P}{4}\)、b 桿拉力=\(\frac{P}{2}\)、c 桿拉力=\(\frac{P}{4}\)
(D) a 桿拉力=\(\frac{2P}{5}\)、b 桿拉力=\(\frac{P}{5}\)、c 桿拉力=\(\frac{2P}{5}\)

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