题目：
简述ACTOR、用例可以从不同的层次来描述信息的原因。
答案：
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参考答案：《地震安全性评价管理条例》第十一条规定，下列建设工程必须进行地震安全性评价： （一）国家重大建设工程； （二）受地震破坏后可能引发水灾、火灾、爆炸、剧毒或者强腐蚀性物质大量泄露或者其他严重...
简述ACTOR、用例可以从不同的层次来描述信息的原因。
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