密度大的林分，生物量和净生产力也大。
The stand of big density has a larger quantity of living beings and net productivity.
测量种类净热值或总热值，华白指数，密度，最少空气需要量。
Kind of measurement Net or gross calorific value, Wobbe index, Density and minimum air requirement.
目的：观察加强蝇必净、奋斗呐在餐饮业灭蝇效果，以控制室内、外蝇密度；
Objective: To observe the efficacy of enhanced Yingbijing alpha-cypermethrin against flies in catering trade and control the density of flies indoors and outdoors.
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