2. Railway signals can be divided into home signal, starting signal, distant signal, repeating signal and shunting signal.
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