A. 标准值是荷载的基本代表值，为设计基准期内最大荷载统计分布的特征值
B. 可变荷载的组合值是使组合后的结构具有统一规定的可靠指标的荷载值
C. 可变荷载的频遇值是在设计基准期内，其超越的总时间为规定的较小比率或超越频率为规定频率的荷载值
D. 可变荷载的准永值是在设计基准期内，其超越的总时间约为设计基准期80%的荷载值
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