The wall elements can be made of?
A. brick
B. stone
C. opaque glass
D. precast concrete
E. aluminum
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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
请计算平纹组织、2/1斜纹组织、5枚3飞经面缎纹的平均浖长。同时说明,在织物规格相同的情况下,哪种织物手感最软?