腰麻后常见的并发症有()
A．硬膜外腔血肿
B．化脓性脑膜脊髓炎
C．头痛
D．血压下降
E．尿潴留
参考答案：B, C, D, E
With no agreement ___, the leaders in the six-side talks will spend another two hours, ___in the hotel, ___the nuclear problem of the North Korea.
A．reaching; locking; discussing
B．reaching; locking; having discussed
C．reached; locked; discussing
D．reached; locked; discussed
链栈与顺序栈相比，有一个比较明显的优点即( )
A．插入操作更加方便
B．通常不会出现栈满的情况
C．不会出现栈空的情况
D．删除操作更加方便
