义齿初戴时出现哪一情况需要返工重作（）
A.就位困难
B.下颌偏向一侧
C.发音不清
D.黏膜压痛
E.基托边缘过长
参考答案：B
_____ I say Clancy is a smart boy, he still needs to work hard to achieve his goal. [ ]
A. Then
B. When
C. While
D. As
与二进制小数0．1等值的十六进制小数为（）。
A.0.1
B.0.2
C.0.4
D.0.8
