题目内容

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

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