Because the ideal “rigid joint” and “hinged joint” are inexistent, the stiffness of any connection types is between ideal rigid joint and hinged joint.
因为理
节点和铰接点是不存
，任何连接形式度都是介于理接和完全铰接
间。
Because the ideal “rigid joint” and “hinged joint” are inexistent, the stiffness of any connection types is between ideal rigid joint and hinged joint.
因为理节点和铰接点是不存，任何连接形式度都是介于理接和完全铰接间。
By using Taylor's formula, the article deduces the sufficient condition of the existent extreme value and the necessary condition of the inexistent extreme value of trinary function.
通过利用泰勒公式推导出判断三元函数极值存充分条件和极值不存
要条件。
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