Spotters must take hours of training to master such concepts as smoke density, measured in 'Hartridge units.
检举员必须接受数小时的培训，才能掌握以“哈特·里奇烟度单位”(Hartridge unit)计算的“烟浓度”之类的概念。
Mixing Hydrogen with diesel fuel in model S195 diesel engine, the producing of smoke density is lower in all working conditions.
S195柴油机掺氢燃烧在所有工况下，烟度都有新降低。
The effects of zinc stannate on flame retardancy and smoke suppression of soft PVC were studied by means of LOI, TGA and smoke density measurement.
采用氧指数法、热重分析及烟密度测试法就锡酸锌对软质pvc的阻燃抑烟行为进行了研究。
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