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贴片直插SN74LS244DWR2G，SN74LS194ADR2G，SN74LS240DWR2G，4
贴片直插SN74LS244DWR2，SN74LS240ML2G，SN74LS240MR1G，4
贴片直插SN74LS240MELG，SN74LS221ML2G，SN74LS240DWR2，4
