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Scratch hardness test or scratch test refers to any of a number of methods of measuring scratch hardness. Resistance to abrasion is less affected by surface variations than indentation methods. Scratch hardness is measured with a sclerometer. [1] Attempting to scratch a surface to test a material is a very old technique. [2]
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The balance beam is a rectangular artistic gymnastics apparatus and an event performed using the apparatus. The apparatus and the event are sometimes simply called "beam". The English abbreviation for the event in gymnastics scoring is BB. The balance beam is performed competitively only by female gymnasts.
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Balance beam – dance elements with cross sit landing on balance beam. Floor exercise – acro elements with sideward take off and/or landing into roll. The following gymnastics skills are banned by at least some gymnastics associations: Korbut flip [2] [3] Thomas salto [3] Roll-out [3]
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