求翻译：应掌握所指挥的起重机的技术性能和起重机工作性能，能定期配合司机进行检查。能熟练地运用手势、旗语、哨声和通讯设备。是什么意思？

The crane should have a command of the technical performance and crane performance on a regular basis to check with the driver. Proficient use of gestures, semaphore, whistle and communications equipment.

正在翻译，请等待...

Should grasp the hoist crane technical performance and the hoist crane operating performance which directs, can coordinate the driver to carry on the inspection regularly.Can utilize the hand signal, the flag indicator, the scat singing and the communication equipment skilled.

Should have a command of the technical performance of the cranes and crane work performance, can meet the drivers on a regular basis to review it. Skilled at using gesture, flag signal, whistle and communications equipment.

Should have a command of the technical performance of the cranes and crane work performance, can meet the drivers on a regular basis to review it. Skilled at using gesture, flag signal, whistle and communications equipment.