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【单选题】
关于设计原则和实用设计表达式，下列说法中正确的是（ ）
A.
规范 SL191-2008 的实用设计表达式采用了安全系数 K ，未考虑各因素的随机性质
B.
结构自重属于可控制的可变荷载，所以规范为它分配了一个较小的分项系数
C.
不是所有的荷载都带有不确定的随机性质
D.
可靠指标 b 与失效概率有一一对应的关系，因此， b 也可作为衡量结构可靠性的一个指标
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