【单选题】【消耗次数：1】
预应力混凝土用钢绞线是由（）根圆形截面钢丝绞捻而成的。
①
5
②
6
③
7
④
8
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相关题目
【单选题】
后张法预应力结构构件，钢绞线出现断裂和滑脱的数量不应超过同一截面钢绞线总根数的（ ），且每根断裂的钢绞线断丝不能超过一丝；对多跨双向连续板，其同一截面应按每跨计算。
①
3%；
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2%；
③
3.5%；
④
1.5%
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