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。
To study the subchronic toxicity of formaldehyde by inhalation in rats.
研究甲醛经呼吸道染毒的亚慢性毒性作用。
To study the subchronic toxicity of formaldehyde by inhalation in rats.
研究甲醛经呼吸道染毒的亚慢性毒性作用。
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