检查伸缩杆是否已完全拉伸：请充分拉伸。
Check whether the telescopic pole is fully stretched: Please fully stretch it.
下管的 端口侧面开设有缺口，缺口处设有伸缩杆的卡固装置。
The side surface of a port of the lower tube is provided with a notch which is provided with a clamping and fixing device of the telescopic rod.
所述的伸缩杆的外端固定连接有牵杆，在该牵杆的端部连接有保险牵引钩。
One end of the draw rod fixedly connected with the outer end of the telescopic rod is connected with a safety draw hook.
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