البحث
إكتشاف أشخاص جدد وإنشاء اتصالات جديدة وصداقات جديدة
a chemical reaction between two compounds where the positive ion of one compound is exchanged with the positive ion of another compound
a chemical reaction between two compounds where the positive ion of one compound is exchanged with the positive ion of another compound
a chemical reaction between two compounds where the positive ion of one compound is exchanged with the positive ion of another compound