???????????? ??????????? ?????????? ????????
Test 1. Crane 56. Test 2. Types of cranes 57. Supplementary Texts 60. Topical Vo
cabulary 72. ???????????. ??????-???????????? ??????? ????? ..... Since
plastics combine all the fine characteristics of a building material together with
good insulating properties, and are fireproof as well, it is no wonder that the ...