2. Railway signals can be divided into home signal, starting signal, distant signal, repeating signal and shunting signal.
对
举一反三
- According to the meaning of stop signal, it is divided into absolute signal and permissive signal.
- Generally speaking, digital transmission can get higher signal quality than analog transmission, because? A: The repeater can regenerate digital pulses to remove signal distortion, and the amplifier amplifies the analog signal as well as the analog signal distorted B: Digital signals are smaller than analog signals and are not prone to distortion C: Analog signals are continuous and are not prone to distortion D: Digital signal is easier to sample than analog signal
- According to the meaning of stop signal, it is divided into absolute signal and _____.
- According to the meaning of stop signal, it is divided into absolute signal and （ ）. A: clea B: permissive signal C: estricting D: approach
- _____, the train started. A: The signal given B: Giving the signal C: The signal being given D: The signal giving
内容
- 0
国际信号规则的英文名称是 (单选题) A: international signal regulation B: international code of signal C: international signal code D: the international code of signals
- 1
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
- 2
________, the train started. A: The signal given B: After the signal was given C: Given the signal D: A and B
- 3
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
- 4
The filtered signal will have a time delay compared with the original signal. ( )