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【单选题】
CRH2A型动车组警惕报警试验时,主控端警惕报警蜂鸣器响起后,( )秒后,确认主控端司机室故障显示屏中"紧急制动"灯亮。
A.
10
B.
8
C.
6
D.
4
参考答案：
参考解析：
刷刷题刷刷变学霸
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