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