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【简答题】
凡属于 ___的化学物质一般要求选择第三阶段甚至第四阶段的某些项目进行测试,特别是对其中产量较大、使用面广、接触机会较多或化学结构提示有慢性毒性、遗传毒性或致癌性可能的物质,必须进行全部四个阶段的试验。
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