Meanwhile, three different wet contactacid processes are compared.
并对三种不同技术进行了比较。
2
Does that metal pit after contact with acid?
那种金属同酸接触后是否会起凹点？
《新英汉大辞典》
3
A country's production of sulphuric acid is a good indication of its industrial might, because at some stage nearly every manufactured good comes into contact with this highly corrosive stuff.