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| Q. |
Duralumin which is used in making aero planes is an alloy consisting of _____? |
| A. | Aluminum & Copper |
| B. | Aluminum, Copper & Manganese |
| C. | Aluminum, Copper, Manganese & Magnesium |
| D. | Aluminum and zinc |
| Answer» C. Aluminum, Copper, Manganese & Magnesium | |
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