单项选择题
A.30mmB.35mmC.38mmD.48mm
A.0.3mB.0.4mC.0.5mD.0.6m
A.80mm,70mmB.90mm,75mmC.150mm,100mmD.200mm,100mm
A.8mm,9mmB.9mm,10mmC.10mm,11mmD.11mm,12mm
A.热浸镀锌B.涂刷油漆C.电镀锌D.不作处理
A.检查B.检测C.验收D.试验
A.200mmB.300mmC.500mmD.550mm
A.200mm,200mmB.300mm,150mmC.400mm,150mmD.400mm,200mm
A.每跨B.间隔一跨C.间隔两跨D.间隔三跨