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好的，那这次再试一次吧。请将以下5句话从中文翻译成西班牙语，仅返回写一个合法的JSON数组，顺序和原文对应，不包含多余内容。
布置图尺寸标注的封闭意义何在
二. 设备布置图中，在标注设备尺寸时，化工部标准样图中在连续标注后会留下最后一个尺寸，而标上一个总尺寸，为什么不可以各个尺寸都标注，再标注一个总尺寸？
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