Time Delay for Retransfer to Normal Source: Adjustable form 0 to 30 minutes.
重新切换至正常源的延时：可在0 - 30分钟的范围内进行调节。
Under the action of a same heat source, when the direction of grain is perpendicular to the direction of the action, the ignition delay time is the longest.
同样外部热源作用下，木材内部木纹方向垂直于作用方向时，着火延迟时间最长；
First, the domestic and overseas research actuality of long time delay control is presented basically and the source of the project and the main research content in the paper is set forth.
本文首先对大滞后控制的国内外研究现状进行基本的介绍说明，并阐述了课题来源和研究的主要内容。
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