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集成电路封装SN74LS169芯片
SN74LS191JSN74LS191DSN74LS191NSN74LS192J
SN74LS00ANSN74LN191NSN74LS00CBSN74LS00DB
可逆计数器SN74LS191NHD74LS191P
集成电路SN74LS165芯片175P
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