题目内容

关于预警系统信号级别的表述有误的是( )。

A. Ⅰ级预警,表示安全状况特别严重,用红色表示
B. Ⅱ级预警,表示受到事故的严重威胁,用橙色表示
C. Ⅲ级预警,表示处于事故的上升阶段,用黄色表示
D. Ⅳ级预警,表示生产活动处于正常状态,用绿色表示

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