贴片直插SN74LS240ML2，SN74LS221ML1，SN74LS240DWR，4
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贴片直插SN74LS221ML1G，SN74LS194ADR2，SN74LS221DR2G，4
贴片直插SN74LS240DWR，SN74LS221DR2，SN74LS221ML1，4
贴片直插SN74LS221ML1G，SN74LS193ML1G，SN74LS195ADR2，4
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