下列关于酸碱度的说法中正确的是（） A.PH介于6-9之间是中性 B.PH值是污水化

白屑风之血虚风燥证病因病机为：

A．水痘
B．传染性软疣
C．扁平疣
D．天疱疮
E．带状疱疹

When I turned to Tony for help, I found that the more he tried to explain, ___________.

A．the more I became confused.

B．the more confused became I

C．the more confused I became

D．I became more confused.

塑料的优点。

Word 2003的窗口组成包括（）。

A.上网图标

B.标题栏

C.菜单栏

D.工具栏

E.上下滚动条

精馏是利用液体混合物中各组分的密度不同来进行分离的。（）