所以，加工中心机床用户一定要保存好原始程序资料、修改记录，做好软件备份，这样可大大缩短维修时间。
Therefore, the processing center of the user must preserve the original program information, modify records, do a good job of software backup, this can greatly shorten the maintenance time.
当指派结构给新变数时，就会复制所有资料，而新变数所做的任何修改都不会变更原始复本的资料。
When a struct is assigned to a new variable, all the data is copied, and any modification to the new copy does not change the data for the original copy.
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