吊杆

• Lift / lower the derricks of no . 3 hatch
  升起/放下3号舱的吊杆。
• Lift lower the derricks of no . 3 hatch
  升起放下3号舱的吊杆
• Application of modbus communication protocol in sloat control system
  通信协议在舞台吊杆控制系统的应用
• Let ' s keep away from the derricks
  咱们离吊杆远一点走。
• Please adjust your derricks properly
  请把吊杆调整好。
• Specification for derrick boom clamp
  起重机吊杆夹规范
• Ships ' light load derrick booms
  船舶用轻载起重机吊杆
• A research in an integrated protection system of platform booms based on plc
  的舞台电动吊杆综合保护系统的研究
• Ships ' boom davits for general use
  船用一般吊杆
• Please swing the boom overside
  请把吊杆甩到外档