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time2013/07/22
Formhttp://www.labnews.co.uk/news/doughnut-shaped-electromagnetic-fields-demystify-dark-matter/#more-336
Viscometers measure the viscosity and flow properties of fluids. Viscosity arises from the internal friction of a fluid and is defined as a liquid’s resistance to flow or shear stress.
time2013/10/10
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