According to the meaning of stop signal, it is divided into absolute signal and ( ).
A: clea
B: permissive signal
C: estricting
D: approach
A: clea
B: permissive signal
C: estricting
D: approach
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 _____.
- 2. Railway signals can be divided into home signal, starting signal, distant signal, repeating signal and shunting signal.
- _____, the train started. A: The signal given B: Giving the signal C: The signal being given D: The signal giving
- ________, the train started. A: The signal given B: After the signal was given C: Given the signal D: A and B