开关量输出电路的作用是什么？
参考答案：
将动作信号、命令等转换为接点量输出。
She may have missed the train, she won’t arrive for another hour. [ ]
A. in that case
B. in this case
C. by which case
D. in which case
信源编码是为了提高通信的可靠性，进行抗干扰编码或者说差错控制编码。
