The method and process of fabrication of tubesheet in double-tubesheet heal exchanger by using common sway arm driller were introduced in this article.

介绍了一种使用普通摇臂钻床加工双管板换热器管板方法和操作过程。

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It doesn't heal instantly, but will heal for about double what CoH does over its duration.

虽然不是立刻治疗，但治疗总量是治疗之环的双倍。

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Economists say the nation needs to create double that figure to lower unemployment and help the economy heal.

FORBES: U.S. Adds Surprising 146K Jobs In Nov.; Unemployment Down To 7.7%