• 备用密封帽(12)内主阀密封组件(20)二级密封

    The backup seal is secondary to the main stem seal assembly (20) in the bonnet (12).

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  • 因此二级密封价格招标一级密封价格招标有效率的方式,对研究具有重要的理论与实践意义。

    So we can say that the second-price sealed bidding is more efficient than the first-price sealed bidding. Therefore, it is important to research in this f…

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  • 近日齐鲁石化炼油厂连续重整车间加氢裂化高速成功改用国产二级机械密封改造后运行状况良好。

    Recently, the CCR of Qilu Petrochemical refinery hydrocracking workshop successful switch to domestically produced high-speed secondary pump mechanical seals, modified to run in good condition.

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  • 研究了电力市场中的复杂拍卖一级价格密封拍卖、出清价格拍卖二级价格密封拍卖。

    Three kinds of complex bid is studied: first price sealed-bid auction, second price sealed-bid auction, and clearing price auction.

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  • 确保真空除气系统正常运行二级除盐水箱密封效果控制腐蚀主要手段

    The insurance of the normal operation of vacuum degassing system and sealing performance of the desalted water drum was the important measure to control the corrosion.

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  • 确保真空除气系统正常运行二级除盐水箱密封效果控制腐蚀主要手段

    The insurance of the normal operation of vacuum degassing system and sealing performance of the desalted water drum was the important measure to control the corrosion.

    youdao

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