三致作用 指毒物的致突变、致癌和致畸作用。突变是指机体的遗传物质在一定条件下发生突然的根本的变异。突变可以由化学(毒物)、物理(电离辐射、紫外线等)及生物因素(病毒感染等)引起,其中化学因素占重要地位。有致突变作用的化学物质称为化学突变物。凡能引起人类或动物癌瘤? Three effects refers to the mutagenicity of toxins, carcinogenic and teratogenic effects. Mutation refers to the body’s genetic material under certain conditions, a sudden radical mutation. Mutations can be caused by chemical (poison), physical (ionizing radiation, UV, etc.) and biological factors (viral infection, etc.), of which chemical factors play an important role. A mutagenic chemical called chemical mutants. Where can cause human or animal cancer?