Question
What is (1) an electric generator (2) an AC generator (3) a DC generator?
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| Column I | Column II | Column III | Column IV |
| (1) Ethylene | Polyethylene | Tetrafluoroethylene | —————– |
| (2) Polypropylene | Propylene | Polystyrene | —————– |
| (3) Polysaccharide | Glucose | Proteins | —————– |
| (4) Rubber | Isoprene | D.N.A. | —————– |
| (5) Wood | Cellulose | Chromosomes of plants | —————– |