According to the meaning of stop signal, it is divided into absolute signal and _____.
举一反三
- According to the meaning of stop signal, it is divided into absolute signal and permissive signal.
- According to the meaning of stop signal, it is divided into absolute signal and （ ）. A: clea B: permissive signal C: estricting D: approach
- 2. Railway signals can be divided into home signal, starting signal, distant signal, repeating signal and shunting signal.
- Answer the following questions according to the text1、What is a signal?
- _____, the train started. A: The signal given B: Giving the signal C: The signal being given D: The signal giving