The main points and difficult points in the drilling machining of balance tube for screw panel in the drilling and the method of solving these problems are introduced in this article.

超临界锅炉水冷壁螺旋管屏的平衡管管孔加工难点和要点，以及解决的工艺措施。

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When you put this in a centrifuge your force on this glass is so high that you must always make sure that you balance it with another tube that you fill with water on the other side.

试管放入到离心机，因为试管上的力很大，所以必须在另一侧放入，同样装水的试管，才能达到平衡。

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Based upon the shield construction practice in the portal section of South Tube of Yanan Donglu Tunnel, this paper demonstrates the technology for slurry balance shield passing through freezing zone.

本文以上海延安东路隧道南线盾构进洞段工程施工为背景，论述了泥水平衡盾构穿越冻结加固区的施工技术。

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Shashi Verma, TfL's director of customer experience, said: ''Pay as you go Oyster cards do not expire and customers are able to return their cards to a Tube ticket office at any time for a refund of the remaining balance and card deposit.

BBC: Unused Oyster cards valued at ?55m