单项选择题
A.50mm B.60mm C.70mm D.100mm
A.50% B.60%~70% C.75% D.100%
A.80% B.85% C.95% D.98%
A.钢筋松弛率 B.冷拉拉伸率 C.冷拉弹性回缩率 D.对焊接头的个数
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