成牙本质细胞突起形成的结构是()。
A.釉质生长线
B.釉板
C.釉丛
D.釉梭
E.绞釉
参考答案:D
Was the door of the house ______ all night? [ ]
A. remained opening
B. kept opened
C. left open
D. remained open
普萘洛尔临床用途不含()
A.高血压
B.心绞痛
C.心律失常
D.甲状腺功能亢进
E.高脂血症