单项选择题
A.伸至柱顶弯折12d B.伸至柱顶加锚头(锚板) C.伸至柱顶弯折15d D.伸至柱顶截断
A.8d B.12d C.15d D.10d
A.1.5lae B.1.2lae C.0.5labe D.1.5labe