YB25/YB45包装机显示屏上的信息颜色有()种。
A.4
B.5
C.6
D.7
参考答案:C
— _____ ?
— Yes,it is.
[ ]
A. What's this
B. Are you Ann
C. This is a notebook
D. Is this a notebook
简述霍曼斯的理论缺陷。