reference:sectionitems
截面对象
XT已经预置了T型、L型、H型、C型、圆管、矩型、圆型等截面类型。它们的类图如下：
T型截面
实现子类SectionT，从XSection继承，类型标识为“CSECT”.
reference/sectionitems.txt · Last modified: 2023/05/06 07:01 (external edit)
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