下列选项中，属于地下卷材防水层特点的是( )。
A．机械强度低
B．卷材吸水率小
C．施工简便
D．耐久性差
E．修补困难
参考答案：A,D,E
磷脂交换蛋白
－You've changed a lot, Eric. I remembered you ____ quiet, didn't you?
－Yes, I did. Now I'm quite outgoing. [ ]
A. used to be
B. were used to be
C. used for being
D. were used for being
