4. Choose the one best answer a, b, c to the statements.

1. Using prefabricated or precast elements ...

a) depends only on the kind of load to which it is subjected.

b) builders perform a considerable amount of building work not in site but at a factory.

c) made possible mass production of large-size structural elements.

2. Reinforced concrete is a building material in which ...

a) such properties as small volume weight and high thermal conductivity are combined.

b) physical and mechanical properties at a normal temperature of 20°C make it semi-rigid and soft.

c) the joint functions of concrete and steel are advantageously utilized.

3. Bricks generally present a pleasing appearance and ...

a) they are light-weight building materials.

b) cannot be used in structures subjected to tensile stresses.

c) can be obtained with various qualities, colors and textures.