The closed-loop system differs from the open-loop system by（）<br>A:the lack of a feedback<br>B:the presence of a feed back<br>C:the lack of a computer<br>D:the presence of a computer

The closed-loop system differs from the open-loop system by（）
A:the lack of a feedback
B:the presence of a feed back
C:the lack of a computer
D:the presence of a computer

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