a fixed signal that lets engineers know if a train can enter a block.
A: ABS (automatic block system)
B: lock
C: lock signal
A: ABS (automatic block system)
B: lock
C: lock signal
C
举一反三
- manual block A: block controlled manually by a person known as a block operator. B: a fixed signal that lets engineers know if a train can enter a block.
- block signal A: a fixed signal that lets engineers know if a train can enter a block. B: a conductive connector used to maintain circuit continuity for track circuits and electrified tracks.
- The Switch block in the Signal Routing block library can be used to implement a piecewise function.
- _____, 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
内容
- 0
数控机床锁定开关的英文是( )。 A: SINGLE BLOCK B: MACHINE LOCK C: DRY RUN D: POSITION
- 1
调用Condition的await()和signal()方法，可以在执行Lock的lock和unlock方法之间的代码中调用，也可以在其他有需要的地方使用。
- 2
lighting and signal system
- 3
2. Railway signals can be divided into home signal, starting signal, distant signal, repeating signal and shunting signal.
- 4
要确保Application对象不被多个用户同时更新，使用此对象的两个方法（ ）。 A: lock() unlock() B: block() unblock()