口角位置相对于()。
A.尖牙与第一前磨牙之间
B.中切牙与尖牙之间
C.第一、二前磨牙之间
D.第二前磨牙与第一磨牙之间
E.中切牙与尖牙之间
参考答案:A
It is required that the students _____ mobile phones in their school, so seldom _____ them using one. [ ]
A. shouldn't be used; will you see
B. not use; will you see
C. don't use ;will you see
D. shan't use; you will see
在DOS系统中,扩充内存管理程序为()
A.MEMMAKER
B.EMM386.EXE
C.HIMEM.SYS
D.SMARTDRW.EXE