swinging derrick

汉英船舶工程 - 豆丁网 ... 白昼信号灯||daylight signalling light 摆动吊杆装置||swinging derrick 摆墩||blocking arrangement ...

航海及海运专业词汇英... ... swinging derrick system 单杆吊货法 swinging derrick 摇摆研磨机 swinging derricks 摆动双杆操作 ...

...恰当? {友友装置(yo-yo gear)法 | 回杆悬垂(swinging derrick)法 | 重吊(heavy lift derrick)法 | 双带(doubling up)法}