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问题 单项选择题

（）官员作为嘉宾出席了美国黑帽子黑客大会

A.美国国家安全局局长

B.美国总统

C.美国司法部长

D.美国联邦警察局局长

答案

参考答案：A

选择题

       2007年4月10日，国家发改委正式公布了能源发展“十一五”规划，提出以能源的可持续发展支持我国经济社会可持续发展。“……生于水际，沙石与泉水相杂，惘惘而出，……颇似淳漆，然（燃）之如麻，但烟甚浓，所沾幄幕皆黑。余疑其烟可用，试扫其煤以为墨，黑光如漆，松墨不及也，……此物后必大行于世，自余始为之。……生于地中无穷，不若松木有时而竭。”这段记载最有可能出自  [ ]

A．《齐民要术》

B．《四民月令》

C．《梦溪笔谈》

D．《农政全书》
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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 (71) to accomplish this. Another responsibility of a transport layer protocol is to create a (72) and error-control mechanism at the transport level. TCP uses a sliding (73) protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve (74) control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends (75) 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.

A．path

B．window

C．frame

D．diagram
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