纯水就是去掉了水中的全部电解质与非电解质，也可以说是去掉了水中的全部非水物质。（）
参考答案：对
“某大学现有语文系、经济系、物理系等17个系”这是______
A．正确的划分 B．错误的划分C．把整体分为部分 D．分类
I am delighted as chairman of the students，union last winter.
A．to appoint
B．to be appointed
C．to have appointed
D．to have been appointed
