| 摘要 |
A workpiece includes a positional marker and defines a number of round recesses. The positional marker includes first positional projection, at least one second positional projection, and at least one third positional projection. The first positional projection defines a first diagonal and a second diagonal. The second positional projection is arranged along the first diagonal, and has a diagonal on the first diagonal. The third positional projection is arranged along the second diagonal, and has a diagonal on the second diagonal. Each of the first positional projection, the at least one second positional projection, and the at least one third positional projection is surrounded by four round recesses of the number of round recesses.
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