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
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
A、painting; calligraphy
B、painting; playing chess
C、playing chess; playing zither
D、calligraphy; playing zither
A、bú shì...yě shì 不是...也是
B、Shì ... jiù shì 是...就是
C、Shì...yě shì 是...也是
D、bú shì...ér shì 不是...而是
A、right; decline
B、right; increase
C、left; decline
D、left; increase
A、A. that he is thinking
B、B. to be thinking
C、C. that he is to think
D、D. to think
A、jobs
B、time
C、people
A. FTP
B. Telnet
C. SMTP
D. DNS
E. HTTP
F . POP3
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