Take a long pole, the joints should be staggered, with two lengths to the top of the mandrel and then leveling.

立杆接长时，接头应错开，至顶层后再用两种长度的顶杆找平。

youdao

Take a long pole, the joints should be staggered, with two lengths to the top of the mandrel and then leveling.

立杆接长时，接头应错开，至顶层后再用两种长度的顶杆找平。

youdao