| http://www.w3.org/ns/prov#value | - The number of times of descent is measured by the counter 23. [0214] The tap density of the cathode active material is measured using the above tester as follows: [0215] First, 5 to 10 g, such as 10 g, of a sample, accurately weighed, are quietly charged into a graduated test tube 15 of 20 ml.
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