Ответьте на вопросы к тексту

1. What does the structure consist of?

2. What is a mast made of?

3. How is each mast support provided?

4. How do suspension trusses function?

5. What does the floor structure consist of?

6. How are important elements of the building protected against corrosion?

7. What makes the external skin of the building unusually complex?

8. How are office areas clad?

9. What does the cladding of the stairs on the east and west sides feature?

10. How are the service modules and ‘risers’ clad?

11. What is the fourth type of cladding?