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贴片直插SN74LS541DWR2，SN74LS393MELG，SN74LS393MR1G，4
贴片直插SN74LS541ML1G，SN74LS393ML2G，SN74LS541MELG，4
贴片直插SN74LS42MELG SN74LS393DR2 SN74LS393MR1 4
