写出下列原子团的名称或符号：

硫酸根离子______；氢氧根离子^-______；铵根离子______ 硝酸根______；碳酸根______；

a：氢气______；b：液氧______；c：硫酸______；d：硫酸铜______；e：氯化亚铁______；

f：氢氧化钠______； g：氯化镁______；i：氯化氢______；j碳酸钠______．

（）computer is a personal computer whose hardware is capable of using any or all 0f the following media in a program：audio，text，graphics，video and animation．

A．database

B．multimedia

C．network

D．mainframes