14. Structural concrete in which internal stressed have been introduced to reduce potential tensile stresses in the concrete resulting from loads is a ….
A. prestressed concrete;
B. heavy industry;
C. light industry;
D. iron.
15. …. Is an attractive interaction between two molecules that results in a stable association in which the molecules are in close proximity to each other
A. Molecular association;
B. nuclear association;
C. chemical association;
D. additional pressure.
16. In the manufacture of Portland cement, … occurs as lumps or nodules, usually 3 millimeters to 25 millimeters in diameter
A. clinker;
B. calcium;
C. alit;
D. belie.
17. … is a light weight porous building material obtained by baking the low melting clay, heating it up to 1050-1300 C temperature
A. claylike;
B. clinker;
C. precast concrete;
D. construction.
18. People have used …. And … for foundations for thousands of years
A. sandstone;
B. marble cement;
C. concrete stone;
D. sand cement.
19. Natural building materials are
A. 3,4,6;
B. 6,7,8;
C. 2,3,7;
D. 5,6,7.
20. 1-cement
2-concrete
3-stone
4-timber
5-cast-iron
6-limestone
7-plywood
8-map
… materials are used for insulation in the enclosing structures of buildings, in industrial equipment, and in piper
A. that insulating;
B. natural;
C. artificial;
D. cold insulating.
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