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全新SN74LS148NSR SN74LS145DG4 SN74LS13DR2G SN74LS139MR1
贴片直插SN74LS145ML1 SN74LS139MR1 SN74LS145MEL 4
贴片直插SN74LS148DR2G，SN74LS139MR1G，SN74LS145MELG，4
