外注：朗琴超高精度表仅限男子款式；女款手表采用经典石英机件。
Above: Longines Conquest VHP is available as men's model only. Ladies model with classic quartz movement.
外注式单体液压支柱推广使用中逐渐暴露出诸如重量重、污染环境等问题。
When DW single hydraulic props are widely used, problems, such as heavy weight, pollution and so on, appear.
介绍了外注式单体液压支柱试压头的改造过程，对其进行改进可以降低劳动强度，提高试压安全性能和劳动效率。
This paper introduces the improving process of outside pour type hydraulic prop. It can reduce Labour strength, raise pressure text safety and work efficiency.
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