The quality of spot welds in galvanized sheet metal was evaluated by using ultrasonic waterimmersion focusing method.
采用水浸超声聚焦直入射法对镀锌薄钢板点焊接头进行了质量评价。
2
Methods The influencing factors to the effective duration of niclosamide in water and soil was investigated by the snail immersionmethod and the fish toxicity test .
方法用浸泡杀螺试验和鱼毒试验,观察氯硝柳胺在水体及土壤中持效时间及其影响因素。
3
Method: The model of gastric ulcer was established by restraint plus water-immersion stress in rats.