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根据《移动通信工程钢结构验收规范》（YD/T5132—2005），二级焊缝质量等级及缺陷分级探伤比例的计数方法应按以下（）原则确定。A.
对工厂制作焊缝，应按每条焊缝计算百分比，且探伤长度应不小于200mm，当焊缝长度不足200mm时，应对整条焊缝进行探伤
B.
对工厂制作焊缝，应按每条焊缝计算百分比，且探伤长度应不小于100mm，当焊缝长度不足100mm时，应对整条焊缝进行探伤
C.
对现场安装焊缝，应按同一类型、同一施焊条件的焊缝条数计算百分比，探伤长度应不小于100mm，并应不少于1条焊缝
D.
对现场安装焊缝，应按同一类型、同一施焊条件的焊缝条数计算百分比，探伤长度应不小于200mm，并应不少于1条焊缝
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