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levelInstrument for finding horizontal level, or adjusting a surface to an even level, used in surveying, building construction, and archaeology. It has a glass tube of coloured liquid, in which a bubble is trapped, mounted in an elongated frame. When the tube is horizontal, the bubble moves to the centre. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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outdoors and found levels up to 162 percent greater than in the control group. Researchers have found levels of nitrates rising as high as 331 milligrammes per litre, well above World Health Organisation guidelines for a maximum of 50. Ohlsson from the University of Gothenburg presented some very important data that found levels of DHEA and DHEA-s in older men strongly predicted death by cardiovascular disease (CVD). |
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