MTM改善前牙区美观及咬合可实现()。
A.纠正重度前牙反
B.关闭前牙间隙
C.牙弓间隙足够时,纠正前牙扭转、错位
D.纠正牙及牙槽性前牙反
E.除A外皆可
参考答案:E
John wants to _ __ the Music Club and becomes a new member of it.
A.join
B.join in
C.will join
D.take part in
一个圆锥形零件,它的底面直径是4厘米,高3厘米,它的体积是多少立方厘米?