According to the meaning of stop signal, it is divided into absolute signal and permissive signal.
举一反三
- According to the meaning of stop signal, it is divided into absolute signal and （ ）. A: clea B: permissive signal C: estricting D: approach
- According to the meaning of stop signal, it is divided into absolute signal and _____.
- 2. Railway signals can be divided into home signal, starting signal, distant signal, repeating signal and shunting signal.
- The filtered signal will have a time delay compared with the original signal. ( )
- The signal transmission portion of the analog video surveillance system is responsible for the upstream transmission of the video signal and the downstream transmission of the control signal. ( ) A: 正确 B: 错误