【单选题】【消耗次数：1】
屈强比愈小，反映钢材受力超过屈服点工作时的（）。
①
可靠性愈小，结构安全性愈低
②
可靠性愈小，结构安全性愈高
③
可靠性愈大，结构安全性愈高
④
可靠性愈大，结构安全性愈低
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