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1. 
What is a structure?
A.
A structure is an object, mechanism, or a barrier.
B.
A structure holds objects, mechanisms and has to be stable.
C.
A structure does not need to be stable.
D.
A structure is something that can overcome barriers.
2. 
What are the types of structures?
A.
Natural structures
B.
Artificial structures
C.
Technological structures
D.
Informatic structures
3. 
Types of artificial structures
4. 
How are triangulated structures build?
A.
By forming triangles with ropes
B.
By forming circles
C.
By forming triangles, using bars
5. 
What happens in Traction?
A.
The forces tend to stretch it
B.
The forces tend to cut it
C.
The forces tend to commpress it
D.
The forces tend to curve it
6. 
A structure is stable when...
7. 
The base of a structure must be...
A.
As wide as possible
B.
As long as possible
C.
As stable as possible
D.
As short as possible