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
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The wall elements can be made of?
A. brick
B. stone
C. opaque glass
D. precast concrete
E. aluminum
Windows and doors can be built of?
A. glass
B. plastics
C. wood
D. aluminum alloy
E. plastic steel
According to particle size, soils can be graded into?
A. silt
B. clay
C. sand
D. gravel
E. rock
介绍信是一种长期有效的专用书信。
A. 对
B. 错