Решение:
- 1. Aluminum is now the first most widely used metal in the world. (-)
- 2. It is possible to braze aluminum. (+)
- 3. Aluminum isn't brittle at low temperatures. (-)
- 4. Aluminum is a poor conductor of heat and electricity. (-)
- 5. The energy input during machining of aluminum is high. (+)
- 6. Aluminum has a thin layer of oxide, which protects it from damages. (+)
- 7. Aluminum is magnetic. (-)
- 8. Aluminium is easily recycled. (+)
- 9. Aluminum has poor formability. (-)
Ответ: Выберите (+) или (-) для каждого предложения.