为确保您的烟雾探测器的安全运行，请执行以下操作：如果烟雾探测器正常工作，则红灯常亮。
Do the following to ensure the safe operation of your smoke detector: if your smoke detector is working properly, the red light should be on.
常亮模式：时间一直显示着。
本文介绍了一种新改进的常亮式光电旋转粘度计。
In this article the author gives an account of his newly renovated slag viscosimeter.
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