Where ______________?[ ]
A. the school is
B. is the school
C. are the school
答案:B
一般情况下余留牙的拔除牙槽骨吸收应达到()
A.牙根1/4
B.牙根1/3
C.牙根1/2
D.牙根2/3
E.以上均不对
调度自动化系统需要在厂站装设()。
A.EMS
B.AGC
C.RTU
D.CRT