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The quality index of vacuum tube from which to measure
Publisher:admin Addtime:2016-05-23 View counts:
In the face of various kinds of solar vacuum heat collecting pipe, so that many users are temporarily do not know how the choice of high-quality vacuum tube products, Xinyuan Xiaobian take you know what measure the main indicators of the quality level of the heat collecting tube: absorption rate and emission rate, average heat loss coefficient, interlayer vacuum degree, stuffy drying temperature, air drying temperature etc..
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