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這道題中的杆就是所謂的二力杆(只受拉力或者壓力的杆),二力杆受力方向一定是沿杆的. 你的疑問是:杆受力不一定沿杆,的確是如此,對於受彎矩的杆,受力就不是沿著杆的. 你們高中的物理題中大都是二力杆,幾乎不會出現杆受彎矩或者扭矩的情况!
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