属于中调管辖的保护及自动装置，改变定值后，应与调度核对定值。
参考答案：对
The _____ boy was last seen _____ near the East Lake. [ ]
A. missing; playing
B. missing; play
C. missed; played
D. missed; to play
在电气化铁路线路上爆破作业有碍接触网及行车安全时，应先停电后作业。
