1. Hydrogenation catalyst, talafeagai mo fusi lua, fusi tolu, hydrocarbon aromatic, carbonyl, nitrile, fa'aitiitiga nitro
Mea e sili ona mitiia le hydrogen
3. Resistors i le tulaga maualalo tetee i le alamanuia faaeletonika
4. Mea mata mo le potentiometer ma isi vaega ma mea mafiafia ata tifaga mo alamanuia faaeletonika