square tubing
... squares方材、方钢 square tubing正方管 square wobbler方辊头 ...
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管子正方形错排 rotated square pitch
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文中还针对海拔对管母线起晕电压的影响进行了讨论，给出了工程适用的海拔校正方法。
In addition, the influence of altitude on corona onset voltage of busbar is also discussed, and altitude correction method used in the project is suggested in this paper.
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