With the optimal project, the defects of Y-type seal-ring were eliminated. As a result, the Y-type seal-ring can satisfy the seal requirement of hydraulic prop with water medium.

依据最优方案成型的Y型密封圈其缺陷得以消除，符合水介质单体液压支柱对密封元件的要求。

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After just five days, they emailed us a seven-page document with whimsical text, drawings and photos, as well as D-I-Y project instructions.

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