来自饶丰的问题
下列符号的“2”各表示什么意义(1)H2CO3_____________________________________________(2)2NO2________________________,______________________(3)2Ba2+_______________________,______________________-2(4)H2O_________________________,_______
下列符号的“2”各表示什么意义
(1)H2CO3_____________________________________________(2)2NO2________________________,______________________(3)2Ba2+_______________________,______________________-2(4)H2O_________________________,_____________________+2(5)CaI2_________________________,_______________________
1回答
2020-10-09 17:13