单项选择题
A.00011001,01100110,01100111B.00011001,01100111,01100110C.00011001,00011001,00011001D.00011001,11100110,11100111
A.10011110.1101010B.10011010.01111011C.10011110.01111010D.10001110.01111100
A.寄存器B.锁存器C.计数器D.触发器