软交换设备位于NGN的(),提供多种业务的连接控制、路由、网络资源管理、计费、认证等功能。
A.控制层
B.功能层
C.传输层
D.管理层
参考答案:A
When the dispute over duty payment arises between the duty payer and the Customs, the duty payer should first pay the duty and then, within () of the issuance of the duty memo, apply to the Customs in writing for a reconsideration of the case.
A. 10 days
B. 20 days
C. 30 days
D. one year
关于胃溃疡与十二指肠溃疡的差别,下列说法不正确的是
A.十二指肠溃疡可能发生恶变B.十二指肠溃疡容易导致幽门梗阻C.胃溃疡可以发生癌变D.十二指肠溃疡更容易发生上消化道穿孔E.十二指肠溃疡患者的疼痛多为夜间痛