桥式起重机械制造许可证级别划分桥式起重机按额定起重量向下覆盖；有防爆性能的，按防爆等级向下覆盖A 通用桥式起重机320t≥G＞50t电站桥式起重机320t≥G≥1t防爆桥式起重机池贤宇刘仁娜分手绝缘桥式起重机冶金桥式起重机架桥机G≥1tB通用桥式起重机50t≥G＞20t姜文是第几代导演电动单梁起重机G＞10t电动单梁悬挂起重机电动葫芦桥式起重机防爆梁式起重机G≥1tC通用桥式起重机20t≥G≥1t...