How many years does the Rhus generally grow before it is cut for lacquer?
A. 3 years
B. 4 years
C. 8years
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How long has it been since people started to use lacquer in China?
A. 5000 years
B. nearly 10,000 years
C. 2000 years
What’s the color of the raw lacquer when it first comes out from Rhus?
A. white
B. brown
C. black
一物体的三视图上长度标注为2000,其比例为1﹕5,则其实际大小为( )
A. 400
B. 2000
C. 10000
D. 200
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