南京云锦
参考答案：
用料考究，织工精细，图案典雅，色彩富丽堂皇，宛如天上瑰丽、璀璨的云霞，故名云锦。
The book was written in 1946, the education system has witnessed great changes. [ ]
A. when
B. during which
C. since then
D. since when
对-二甲氨基苯甲醛反应呈阳性的是（）
A.A
B.B
C.C
D.D
