二元结构多见于( )中。
A. 河床沉积
B. 漫滩沉积
C. 湖泊沉积
D. 浅海
Civil works can be classified into？
A. silos
B. railroads
C. mass transit system
D. harbours and ports
E. tunnels
F. buildings
When a project begins, who are engaged in it？
A. the owner
B. general contractor
C. subcontractors
D. surveyors
E. architects
F. supervisors
G. project managers
The wall elements can be made of?
A. brick
B. stone
C. opaque glass
D. precast concrete
E. aluminum
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