The back part of the supporting rack is provided with a positioning bracket, and the positioning bracket is provided with a positioning screw bolt.
支撑架背部设有定位支架，定位支架上设有定位螺杆；
The back part of the supporting rack is provided with a positioning bracket, and the positioning bracket is provided with a positioning screw bolt.
支撑架背部设有定位支架，定位支架上设有定位螺杆；
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