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问题 选择题

为应对严重的金融危机，美国总统奥巴马提出了新医疗改革方案，该医改方案分别在美国众议院和参议院获得通过。这表明[ ]

A．美国实行联邦制

B．美国实行三权分立制度

C．美国实行两党制

D．利益集团操控美国政治

答案

答案：B

单项选择题

结核病最主要的传染源是（）.

A.浸润型肺结核患者

B.原发型肺结核患者

C.结核性胸膜炎患者

D.急性血行播散型肺结核患者

E.慢性纤维空洞型肺结核患者
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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 （1） to accomplish this. Anotherresponsibility of a transport layer protocol is to create a（2）and error-control mechanism atthe transport level. TCP uses a sliding（3）protocol to achieve flow control. It uses theacknowledgment packet, time-out, and retransmission to achieve （4） control. The transportlayer is also responsible for providing a connection mechanism for the application program. Theapplication program sends （5）of data to the transport layer. It is the responsibility of thetransport layer at the sending station to make a connection with the receiver.

（4）是（）

A.packet

B.time

C.error

D.phase
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