Prehistoric temples of malta

14. …. 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.
15. 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.
16. … 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.
17. People have used …. And … for foundations for thousands of years
A. sandstone;
B. marble cement;
C. concrete stone;
D. sand cement.
18.… 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.