每一套设备都包括有单根可伸缩杆和一个带有单独的空气通道和水喷嘴的驱动机械。
Each device consists of a single, retractable lance and a drive mechanism equipped with separate air and water nozzles.
铝合金杆身，头部为塑料杯。杆身可伸缩。
Aluminum alloy shaft and plastic head, shaft length could be adjustable.
为变电站用高空作业平台的使用提供依据，并且为高空作业平台特别是工作台面可伸缩的作业平台提供了一种叉杆强度计算参考方法。
The strength of fork rod is adjusted. The extension of the working platform is calculated to get the largest load it can support.
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