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• 17 橫斷面積為 A=1,200 mm2 的桿件（如下圖所示），在水平的軸向壓力 P 作用下，θ =45°剪應力為τθ =25 MPa，則 P 之大小為何？【題組】18 承上題，若該桿件材料之楊氏模數
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