 |
| Chinese | English |
| 世界卫生组织空气质量标准 | WHO Air Quality Guidelines |
| 国际标准化组织标准 | ISO (engineering technical standards code) |
| 标准组合 | nominal combination |
| 标准组合 | characteristic combination |
| 连接组标号 | connection symbol |
| 非洲区域标准化组织 | African Regional organization for standardization |
|
| Chinese | English |
| 世界卫生组织空气质量标准 | WHO Air Quality Guidelines |
| 国际标准化组织标准 | ISO (engineering technical standards code) |
| 标准组合 | nominal combination |
| 标准组合 | characteristic combination |
| 连接组标号 | connection symbol |
| 非洲区域标准化组织 | African Regional organization for standardization |