—I'm sorry for I said.
—It doesn't matter.[ ]
A. how
B. which
C. what
D. where
答案:C
长方形的对边是相互______的,邻边是相互______的.
氧化锌丁香油水门汀的性能特点是:()
A、对牙髓有安抚作用
B、不溶于唾液
C、对牙髓有较强刺激作用
D、抗压强度好