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				| 1. | What is the melting point of Zircon? | 
| A. | 3450°F – 4620°F | 
| B. | 3750°F – 4820°F | 
| C. | 3850°F – 4820°F | 
| D. | 4400°F – 5320°F | 
| Answer» B. 3750¬¨¬®‚Äö√†√ªF ‚Äö√Ñ√∂‚àö√ë‚àö¬® 4820¬¨¬®‚Äö√†√ªF | |