Computers are constructed of digital building blocks such as logic gates, Flip-Flops and counters.
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A binary 4-bit synchronous counter is implemented using 4 JK flip-flops and 2 AND gates.
A. 对
B. 错
PLC在输入采样阶段,扫描所有输入端子,并将各输入状态存入相应的( )寄存器中。
A. 输入映像
B. 输出映像
C. 变量存储器
D. 内部存储器