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half lethal dose
anim.husb. 50 % 致死量
earth.sc. 半致死剂量; 致死中量
el. 半数致死剂量
life.sc. 半数致死量
mol.gen. 50%致死剂量 (分生)
space 半致死量
tech. 半致死剂量; 50%致死量

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