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逻辑门 DUAL 4-INPUT NOR
逻辑门 DUAL 4-IN NOR GATE
逻辑门 DUAL 4-INPUT NOR GATE
逻辑门 DUAL 4-INPUT NOR
逻辑门 DUAL 4-INPUT NOR
逻辑门 DUAL 4-INPUT NOR GATE
逻辑门 DUAL 4-INPUT NOR GATE
逻辑门 DUAL 4-INPUT NOR GATE
逻辑门 DUAL 4-INPUT NOR
逻辑门 DUAL 4-INPUT NOR
逻辑门 DUAL 4-INPUT NOR GATE
计数器 IC 8-BIT SYNC BIN DOWN COUNTER
