| 摘要 |
An apparatus comprising: a support comprising a planar support surface; first protrusions protruding from the planar support surface and located on the planar support surface to position a first planar component within a first area; and second protrusions protruding from the planar support surface and located on the planar support surface to position a second planar component within a second area, which overlaps the first area, wherein at least some of the second protrusions are located within the first area and are configured to retract from a first protruding configuration for positioning a second planar component into a second retracted configuration for enabling the first protrusions to position a first planar component. |
