牙槽骨修整术的手术时间应选择在拔牙后
A.3周
B.2周
C.1周
D.1~3个月
E.6个月
参考答案:E
---Is Michael a man with good manners?
---I don’t think so. As a matter of fact, he is ______but polite.
A.something
B.anything
C.everything
D.nothing
()是孔间距与最小抵抗线的比值。
A.炮眼系数
B.密集系数
C.爆破系数