Methods Subchronic toxicity test was applied. The rats were exposed to arsenic by oral perfusion at gradient doses for 6 weeks respectively.
方法采用亚慢性毒性试验方法，大鼠经口灌胃染毒，试验期为6周。
Methods Acute oral toxicity test, subchronic inhalation toxicity test and mutagenicity test were conducted to observe the effects of petroleum asphalt in experimental animals.
方法通过石油沥青急性经口毒性、亚慢性吸入毒性及遗传毒性的实验研究，观察在该实验条件下，石油沥青对受试动物的影响。
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