这种方法根据微积分关系，确定曲线的始点、形状和末点，即可直接得到不同外力作用下平面弯曲梁的内力图，简捷且易掌握。
According to the calculus relation, the internal force chart can be gained by confirming the begin points, figure shape, ending points. This method is simple and easy to be grasped.
尤其是梁弯曲时内力图绘制的规律较多，不易记忆，容易出错。
Especially it is easy to make errors in drawing internal force diagram of a beam because the rules are too more to memory.
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