临产后子宫收缩特点，下列哪项不正确
A．节律性
B．对称性
C．极性
D．缩复作用
E．持续性
参考答案：E
Among the following cities, which one is NOT a capital city of a country?[ ]
A. London
B. Tokyo
C. Sydney
D. Moscow
( )是蜂窝移动通信网的核心。
A．MS B．BSSC．BTS D．MSC
