... low concentration ratio mirror 低倍率反射镜 low observed effect concentration 产生影响的最低浓度 low concentration mine gas 低浓度瓦斯 ...
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The effect of chlorhexidine hydrofluoride in low concentration was observed during the process of the artificial demineralization of enamel with acid gel.
本文将合成的低浓度洗必太氟氢酸盐加入酸胶中，观察其在釉质脱矿过程中的作用，并用氟化钠对照。
Objective The effect of oxidation and peroxidation in workers exposed to oil refinery waste water in low concentration was observed.
目的探讨低浓度炼油污水作业对人体氧化和过氧化反应的影响。
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