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问题 单项选择题

131I治疗甲状腺功能亢进中下列哪个不是适应证（）

A.<25岁

B.Graves病

C.抗甲状腺药物无效

D.抗甲状腺药物过敏

E.手术复发、禁忌或不愿手术者

答案

参考答案：A

单项选择题

A transport layer protocol has several responsibilities. One is to create a process-to-process (program-to-program) communication; TCP uses port （） to accomplish this. Another responsibility of a transport layer protocol is to create a （） and error-control mechanism at the transport level. TCP uses a sliding （） protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve （） control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends （） of data to the transport layer. It is the responsibility of the transport layer at the sending station to make a connection with the receiver.

and retransmission to achieve （） control.

A．packet

B．time

C．error

D．phase
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多项选择题

下列关于站点选择描述正确的是（）.

A、站点选择避免强干扰源

B、站点周围200米之内不能有明显高楼遮挡

C、智能天线周围40一50米之内不能有明显反射物

D、微蜂窝基站的选取原则和宏蜂窝一样
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