As a key to tunnel smoke control, the critical velocity refers to a minimum vertical ventilation velocity which can effectively control the smoke under the direction of fire source without reversing.
临界风速是隧道烟气控制的关键所在，其指隧道火灾过程中能有效控制烟气于火源下风方向而不发生逆流的最小纵向通风风速。
Fire groups were fighting the fire on Sunday when a sudden change of wind direction caused "a huge fireball".
周日，消防队正在灭火，突然风向改变，造成“一个巨大的火球”。
Rock wool products change due to fiber direction, not only can meet the requirements of fire safety, the tensile strength and compressive strength increase.
岩棉制品因纤维方向发生本质的变化，不但能够达到防火的要求，整体的抗拉强度和抗压强度的提高。
The calculate method and its results would provide theory gist of tunnel fire fighting design, the establishment of the escape direction system and the emergency scheme.
其方法和结论可为特长隧道消防系统的设计、紧急疏散方案和引导指挥体系的建立提供理论依据。
Ships play very differently from land units: they have to be manoeuvred with the wind in mind, they fire massive broadsides at right angles to their direction of movement.
船舶的指挥不同于地面单位：他们必须学会操纵风向，他们沿射击的宽边成直角方向移动。
The little green men to a door run, mark on one side of the arrow, this is tell everyone in the direction of emergency exit, to tell the baby once encountered fire, to the arrow direction to run.
绿色小人向一扇门奔跑，标志的一侧有箭头，这是告诉所有的人紧急出口的方向，告诉宝宝一旦遇到火灾等，要向箭头指引的方向跑。
Directed at fire prevention in goaf, the paper proposes a method of injecting nitrogen and controlling nitrogen air to flow direction using fugitive air and controlling air quantity in gob.
为解决采空区防火问题，提出从采空区漏入风一侧顺流注氮，充分利用采空区漏风流向控制氮气的流向并控制漏风量的注氮思路。
It is of a guiding significance for forest fire forecast, fire fighting direction, use of fire, biological fireproofing and some other aspects.
它对林火预报、可燃物管理、灭火指挥、营林用火、生物防火等方面有重要的指导意义。
To improve the directivity and gain, the four units of plate end-fire antennas are arranged in the direction of end-fire.
为了提高增益和方向性，把四个平板端射天线单元在端射方向上排列。
The distributed intelligent fire alarm system can overcome the flaw of traditional passive fire alarm system. At present it is the main direction of fir...
分布式智能报警系统可克服传统的被动型报警系统的弊端，系目前国内外主要研究方向。
The distributed intelligent fire alarm system can overcome the flaw of traditional passive fire alarm system. At present it is the main direction of fir...
分布式智能报警系统可克服传统的被动型报警系统的弊端，系目前国内外主要研究方向。
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