油漆工进行哪些操作时必须戴防毒口罩呢？
参考答案：
刷耐酸、耐腐蚀的过氧乙烯涂料时。
在软件研制过程中，CASE( )。
A．指CAD和CAM技术发展的动力
B．指正在实验室用的工具
C．指计算机辅助软件工程
D．指计算机辅助系统工程
They suggested the professor ____ just now _____ chairman of the meeting. [ ]
A. referring to; was made
B. referring to; be made
C. referred to; be made
D. referred to; was made
