When you assign one structure variable to another, or pass a structure instance to a procedure argument, the current values of all the variable elements are copied to the new structure.
当将一个结构变量赋给另一个，或将结构实例传递给过程参数，所有变量元素的当前值都复制到新结构中。
2
Steel angle is a general purpose pass, used in all kinds of steel structure, therefore its use scope is extremely widespread, and holds a greater proportion in the steel products production.