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问题 单项选择题

TCP/IP体系结构中的TCP和IP所提供的服务分别为( )。

A．链路层服务和网络层服务
B．网络层服务和运输层服务
C．运输层服务和应用层服务
D．运输层服务和网络层服务

答案

参考答案：D

解析： TCP和IP所提供的服务分别在运输层服务和网络层服务。

单项选择题

Believe it or not，optical illusion can cut highway crashes.
Japan is a case in point．It has reduced automobile crashes on some roads by Rearly 75 percent using a simple optical illusion．Butst．ripes,called chevrons(人字形)，painted on ther rads make drivers think that they are driving faster than they really are，and thus drivers slow down.
Now the American Automobile Association Foundation for Traffic Safety in Washington D．C. is planning t。repeat Japan’s success．Starting next year，the foundati。n will paint cheyrons and。ther pattems of stripes on selected roads around the country to test how well the patterns reduce highway erashes．
Excessive(too great)speed plays a major role in as much as one fifth of all fatal traffic accidents， according to the foundation．To help reduce those accidents，the foundation will conduct its tests in areas where speed-related hazards(danger)are the greatest curves，exit slopes，traffic circles，and bridges．
Some studies suggest that straight，horizontal bars painted across roads can initially cut the average speed of drivers in half．However,traffic。ften returns to full speed within months as driVers become used to seeing the painted bars．
Chevrons，scientists say，not only give drivers the impression that they are driving faster than they reallv are but als0 make a lane appear to be narrower．The result is a longer lasting reduction in highway speed and the number of traffic accidents．

On roads painted with chevrons，drivers tend to feel that______.

A．thev should avoid speed．related hazards
B. they are driving in the wrong lane
C. they should slow down their speed
D. they are coming near to the speed limit
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多项选择题

A注册会计师负责对X公司2009年度财务报表实施审计，现正在考虑与X公司持续经营假设相关的事项。在审计过程中，A注册会计师遇到下列问题，请代为做出正确的专业判断。

如果A注册会计师决定对X公司存在的导致对持续经营假设产生疑虑的重大不确定事项在审计报告的意见段后增加强调事项段进行说明，则应当在强调事项段中指出( )。

A．X公司针对重大不确定事项拟采取或已采取的改善措施

B．X公司对导致持续经营产生疑虑的情况所作披露的序号

C．X公司存在的重大不确定事项的主要情形和可能的后果

D．A注册会计师认为强调事项段不影响已发表意见的说明
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