According to the meaning of stop signal, it is divided into absolute signal and permissive signal.
按停车信号的意义分为绝对信号和容许信号。
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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
内容
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_____, the train started. A: The signal given B: Giving the signal C: The signal being given D: The signal giving
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Answer the following questions according to the text1、What is a signal?
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what is an analog signal? A: Analog signal is a continous values B: Analog signal is a discrete values C: Analog signal is sometimes continous,sometimes discrete
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________, the train started. A: The signal given B: After the signal was given C: Given the signal D: A and B
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signal