修井作业的井架天车部位，一直没有天车安全操作平台。
Derrick-crown positions for repairing Wells are always not provided with safe operating platforms for derrick crowns.
天车控制软电缆可用于电梯、起重设备、升降平台、仓库系统、港口安装。
Crane control software can be used in the lift cables, lifting equipment, the take-off and landing platform, storage systems, installation of the port.
天车控制软电缆可用于电梯、起重设备、升降平台、仓库系统、港口安装。
Crane control software can be used in the lift cables, lifting equipment, the take-off and landing platform, storage systems, installation of the port.
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