| Question | Scientists say the two main … are permanent magnets and electromagnets. |
|---|---|
| Title | 2244 |
| QType (0=kprim,1=mc,2=sc) | 2 |
| Q_1 | kinds of magnets |
| Q_2 | kind of magnet |
| Q_3 | kinds of magnet |
| Answers | 1 0 0 |
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