Select the incorrect match.
| Gas | Main components | |
|---|---|---|
| A | Coal gas | - Hydrogen + Methane |
| B | Natural gas | - Methane |
| C | Petroleum gas | - Methane + Propane |
| D | Biogas | - Methane |
Select the incorrect match.
| Gas | Main components | |
|---|---|---|
| A | Coal gas | - Hydrogen + Methane |
| B | Natural gas | - Methane |
| C | Petroleum gas | - Methane + Propane |
| D | Biogas | - Methane |