在动物急性毒性试验中，使受试动物半数死亡的毒物浓度，用 LC50表示。
The certain concentrations of fipronil approaching the LC50 can negatively affect population parameters of Daphnia pulex.
氟虫腈在水中的质量浓度达到LC50时对大型蚤的种群有影响。
Based on the principles of designs of self-compacting and light aggregate concrete mix, SCLC of LC30-LC50 was developed by using absolute volume method.
参考自密实混凝土和轻骨料混凝土配合比设计原理，采用绝对体积法，成功研制出强度等级为LC30 ~ LC50自密实轻骨料高性能混凝土。
The dosage of interest is typically the lethal concentration, known as LC50, that will kill 50% of the population of organisms in a given period of time.
需要测试的剂量是致命浓度(LC50)在给定时间内能杀死50%生物体的剂量。
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