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贴片直插SN74LS156DR2G，SN74LS153ML1G，SN74LS153MR1G，4
贴片直插SN74LS157MEL SN74LS153MR1 SN74LS156DR2 4
贴片直插SN74LS153MEL SN74LS151MEL SN74LS151MR1 4
