ower-operated;Safety;Testing【摘要】: B30.7 applies to base-mounted drum hoists arranged for mounting on a foundation or other supporting structure for lifting or lowering loads, to derrick swingers, and to any variations which retain the same fundamental characteristics.【中国标准分类号】: J80【国际标准分类号】: 53_020_99【页数】: 【正文语种】: 英语 | 欢迎光临 世界资料网论坛 (http://bbs.infoeach.com/) | Powered by Discuz! X2.5 |