用于冲洗智齿冠周炎的氯己定溶液的浓度是
A．0.1%
B．0.05%
C．0.25%
D．3%
E．0.2%
参考答案：A
You should make it a rule to leave things ________ you can find them again. [ ]
A. when
B. where
C. then
D. which
嵌体箱状洞形的轴壁应（）
A.相互内聚2°～5°
B.相互平行
C.内聚不超过2°
D.外展不超过15°
E.外展不超过10°
