教学重点和难点：掌握梁在纯弯曲（Pure bending）时的正应力（Normal stress）计算、梁的 强度校核（Check the strength）。掌握梁横截面上的切应力，合理截面问题。
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They had to check the strength of the seat attachments to the floor of the plane.
他们需要检查座椅与飞机舱面固定接头的强度。
Check the strength and defect of stitching, approval accept or not.
片的缝口牢度和车缝疵点并判断是否接受。
To check the strength and the rigidity by manual is time-consuming and easy to make mistakes.
人工进行传动轴的强度和刚度验算，既费时，又容易出错。
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