| http://www.w3.org/ns/prov#value | - The figures show a hollow cylinder, a ring, honeycombs having one or at least 2 passing-through channels, a block having a cross-shaped passing-through channel.However, the examples of D1 are only concerned with hollow cylinders, wherein D, d, h and l represent outside diameter, inside diameter, i.e. diameter of hollow space, wall thickness, i.e. the width of solid part in the cross section and he
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