易改变
发表于 2025-3-27 00:21:12
ents, these agencies set standards for acceptable concentration levels of these toxicants in air, water, soil, food, etc. The process of modeling exposure to a toxicant and predicting health or ecological effects is termed risk assessment.
种属关系
发表于 2025-3-27 01:53:25
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遭遇
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魅力
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Ordnance
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空洞
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AND
发表于 2025-3-27 23:45:03
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中子
发表于 2025-3-28 06:04:39
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我怕被刺穿
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越自我
发表于 2025-3-28 11:41:08
Hypothesis Tests & Statistical Models,The heart of classical statistics is hypothesis tests. If you are comparing chemical concentrations between a “background” area and a “potentially contaminated” area, how different do the concentrations in these two areas have to be before you decide that the “potentially contaminated” area is in fact contaminated?