密度: 1.(密集的程度) density; thickness 短语和例子火力密度 density of fire; 兵力密度 density of troops; 那个国家的人口密度为每平方英里685人。 the population density of that country is 685 per square mile.2.[物理学] (物体的质量和其体积的比值) de
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Results found that the photocatalytic activity in low environment temperature ( 8 ) was higher than in high environment temperature ( 30 ) . this phenomenon indicated that the density of surface hydroxyl groups was most important for the photocatalytic activity 研究发现了低环境温度时( 8 )的光催化活性反而比高环境温度( 30 ‘ c )的光催化活性高的异常现象，该现象表明tioz粒子的表面轻基密度对光催化活性具有极大的影响。
