求翻译：构件起吊前要明确重量来选择相应的吊具和起吊方案并交底和设专人指挥；指挥人员要和作业人员密切协作，信号不明确应立即停此作业。是什么意思？

Select the appropriate spreader and lifting solutions to the clear weight of the component lifting and to Jiaodi and set up special command; commanding officers and operations staff in close collaboration, the signal is not clear should immediately stop operating.

Component before lifting to select the appropriate weight lifting equipment and lifting program and it is left to the bottom and set personal command; and the job you want to command staff personnel work closely together, the signal is not clear they should stop the job.

Before the component hoisting up must be clear about the weight to choose the corresponding hoisting mechanisms and the hoisting up plan and gives the low-down and supposes the specialist to direct; Directs the personnel to have to cooperate closely with the operating personnel, the signal is not cl

Widget to clear before lifting weights to select the corresponding spreaders and lifting solutions and command the low-down and the hand; commanding officers and workers in close collaboration, the signal does not clear the job should be stopped immediately.

正在翻译，请等待...