根据无牙颌各部分组织结构特点及与全口义齿的关系,无牙颌被分为以四区,除了()
A.主承托区
B.副承托区
C.边缘封闭区
D.后堤区
E.缓冲区
参考答案:D
解方程:
(1)(x-3)2=2x(3-x)
(2)x2-4x+3=0(配方法)
I've made a mistake, though _____ . [ ]
A. interided to
B. intended
C. didn't intend
D. didn't intend to