. "B is a schematic perspective view showing a base with linear protrusions of the present invention.FIG. 8A is a schematic perspective view showing a sheet, and FIG. 8B is a schematic perspective view showing a base with dot-like protrusions of the present invention.FIG. 9A is a schematic perspective view showing a sheet, and FIG. 9B is a schematic perspective view showing a base with dot-like protr" . . .