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贴片直插SN74LS244MEL,SN74LS240MR2,SN74LS244FNG,4
贴片直插SN74LS244ML2,SN74LS244DWG,SN74LS244MEL,4
贴片直插SN74LS245MR2,SN74LS244ML1,SN74LS245MEL,4