prov:value
| - ny trioxide, metal salts of organic acids such as sodium acetate, potassium acetate, calcium acetate, zinc acetate, ferrous acetate and the like, Lewis acids such asboron trifluoride, aluminum chloride and the like, amines, amides, and inorganic acids such as hydrochloric acid, sulfuric acid and the like.Preferably, sodium acetate, potassium acetate, germanium acetate and titanium isopropoxide are
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