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而像60、70年代的老工房很多都是砖混结构的，其抗震性能就要差一些。 抗震等级是设计部门依据国家有关规定，按“建筑物重要性分类与设防标准”，根据烈度、结构类型和房屋高度等，而采用不同抗震等级进行的具体设计。以钢筋混凝土框架结构为例，抗震等级划分为四级，以表示其很严重、严重、较严重及一般的四个级别。在中国建筑业中，已经开始严格执行这个等级标准