后备模式是移动闭塞系统在非ATC模式下的一种简化了的运营方式。在该模式下,可完成对道岔和信号机的控制,实现部分或全部()功能。
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只有在移动闭塞系统部分或全部故障(即系统瘫痪)的情况下,后备系统才以自动或人工的方式启动,根据设计要求及线路的实际情况,也可以将()系统作为移动闭塞系统的1个子系统,参与正常运营。
The author uses 3 consecutive________to attract the readers attention.
College is designed to be a time of personal ________ and ________.
In this text, the author mainly talks about the developmental changes that college students would often go through during their college years.
A. 对
B. 错