Making the steel plate fasten to the airproof ring tightly, so the plank will not teetertotter while meeting strong wind.

使压型钢板紧固于密封圈，遇强风时压型板不上下晃动。

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Making the steel plate fasten to the airproof ring tightly, so the plank will not teetertotter while meeting strong wind.

使压型钢板紧固于密封圈，遇强风时压型板不上下晃动。

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