| 摘要 |
A positioning apparatus including a first unit that retains an object, and a second unit that retains the first unit. The second unit includes a top plate, a bottom plate which is disposed in parallel with the top plate, and a rib which is disposed between the top plate and the bottom plate. The rib includes a first rib having a rectangular cross section, a second rib having a diamond cross section and connected inside of the first rib, and a third rib having a rectangular cross section and connected inside of the second rib.
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