【单选题】【消耗次数：1】
材料强度标准值是指具有不小于（）的保证率的材料强度值。
①
90%
②
97.73%
③
95%
④
97.5%
参考答案：
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相关题目
【单选题】
材料强度设计值是：
①
材料强度标准值乘以分项系数
②
材料强度标准值除以分项系数
③
正态分布曲线上，具有95%保证率的下分位值
④
正态分布曲线上，具有95%保证率的上分位值
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若记材料强度的平均值为μf，材料强度的标准差为σf，材料强度取值的保证系数为αf，则材料强度标准值fk等于。
①
fk=μf-αfσf
②
fk=μf+αfσf
③
fk=μf
④
以上选项均不对
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