| Share | Phrase |
|---|
| 19.74% | formaldehyde mole |
| 17.59% | formaldehyde to phenol |
| 14.75% | formaldehyde decomposition |
| 11.45% | para formaldehyde |
| 11.07% | react with formaldehyde |
| 6.35% | formaldehyde emission |
| 5.67% | prefer formaldehyde [perform operation] |
| 4.25% | add formaldehyde [perform operation] |
| 2.44% | employ formaldehyde [perform operation] |
| 2.36% | include formaldehyde [perform operation] |
| 2.29% | formaldehyde ratio |
| 1.97% | comprise formaldehyde [perform operation] |