底涂应具备的性能（）
A、与基层及聚脲涂层粘结力强
B、对混凝土基层渗透率高
C、封闭性能好
D、固化时间短
参考答案：A, B, C, D
— I didn't mean _______ her.
— But talking like that means _______ her. [ ]
A. to hurt; to hurt
B. hurting; hurting
C. to hurt; hurting
D. hurting; to hurt
在移动交换子系统中AUC的作用是什么。
