Borax must be reduced to powder for infants.硼砂必须研成细粉才能供婴儿使用.Borax is the compound commonly applied to the soil to correct boron deficiency.硼砂是矫正土壤缺硼的常用硼化合物.It was investigated that chromizing in borax salt bath and melti...
In 1818 Fresnel entered a competition sponsored by French Academy.1818年菲涅耳参加了法国科学院主办的一次竞赛.The difficulty was resolved by Fresnel with his addition of the concept of interference.菲涅耳通过加进来干涉概念,解决了这个困难.In many cases, the Si...