在双柱内固定的方法中无统计学区别。
There is no statistical difference among the double column fixation methods.
特点：电动升降，电动复位，双柱间距离可调。
Feature: electronic rise and down, electronic reset, the distance between the posts can be adjustable.
特点：电动升降，电动复位，双柱间距离可调。
Feature: electronic rise and down, electronic reset, the distance between the posts can be adjustable.
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