A. 设计基准期等于设计使用年限
B. 设计基准期是按结构的设计使用年限的长短而确定的
C. 设计基准期是为确定可变作用等的取值而选用的时间参数
D. 不同的设计基准期则必须相应确定在不同的设计基准期内最大作用的概率分布及其统计参数。
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