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问题 选择题

10月9日至12日，中共_________在北京举行。全会审议通过了《中 * * 关于推进____若干重大问题的决定》，允许农村土地使用权流转。[ ]

A、十七届三中全会   农村改革发展

B、十七届二中全会   农村改革发展

C、十一届三中全会   农村改革发展

D、十七届三中全会   现代农业建设

答案

答案：A

选择题

下列实验方案能达到目的是（　　）

A．除去NaCl固体中混有的MgCl2：加入KOH试剂后过滤

B．实验室获取少量纯净的水：蒸馏自来水

C．SiO2中的CaO，通过加热熔融而除去

D．提取碘水中的碘：加入适量乙醇，振荡、静置、分液
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单项选择题

A transport layer protocol usually has several responsibilities．One is to create a process-to-process communication；UDP uses (71) numbers to accomplish this．Another responsibility is to providecontrol mechanisms at the transport level．UDP does this task at a very minimal level．There is no flowcontrol mechanism and there is no (72) for received packet．UDP, however,does provide errorcontrol to some extent．If UDP detects an error in the received packet，it will silently drop it．
The transport layer also provides a connection mechanism for the processes．The (73) must be able to send streams of data to the transport layer．It is the responsibility of the transport layer at (74) station to make the connection with the receiver,chop the stream into transportable units，numberthem，and send them one by one．It is the responsibility of the transport layer at the receiving end to waituntil all the different units belonging to the same process have arrived，check and pass those that are (75) flee，and deliver them to the receiving process as a stream．

A．sending

B．routing

C．switching

D．receiving
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