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median lethal concentration
avia. 半数致死浓度
environ. 半致死浓度
oil 致死浓度
tech. 中数致死浓度; 致死中浓度
median 50% lethal concentration
anim.husb. 中间 50%致死浓度
median lethal concentration: 2 phrases in 1 subject
Agriculture2

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