CMY模型是采用（）3种基本颜色按一定比例合成颜色的方法。
A.青
B.品红
C.黄
D.绿
参考答案：A, B, C
—Have you finished washing your clothes?
—Yes, I'm _________.[ ]
A. hanging up them
B. hang them up
C. putting up them
D. hanging them up
BPI--31000型焊机是手弧焊电源。
