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问题 单项选择题

操作系统程序与多个用户程序共用系统中的资源,这属于操作系统的【 】。

A．并发性

B．共享性

C．随机性

D．多路性

答案

参考答案：B

解析：操作系统的共享性是指系统程序与多个用户程序共用系统中的符种资源。这种共享是在操作系统控制下实现的。

多项选择题

对采用天然地基的桥台基础进行设计时，应考虑桥台后路堤填土对桥台产生影响的是下列（）选项。 （）

A.由于超载的作用将会提高桥台下地基持力层的承载能力

B.填土使桥台产生附加的不均匀沉降

C.填土时桥台基础产生偏心力矩

D.填土不利于梁式桥台的稳定性
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填空题

Kofi Annan says helping survivors of last week’’s earthquake and (1)________in the Indian Ocean is (2)________. The United Nations secretary-general says countries that have offered aid must (3)________and provide it. The offers add up to around (4)________dollars. United Nations officials say (5) ________of that is needed during the next six months.The concern about offers of international aid is (6)________. For example, the earthquake in Bam, Iran, in (7)________of 2003 killed more than (8) ________people. Countries and groups offered hundreds of millions of dollars (9) ________. The United Nations says it has (10)________only about (11)________dollars in aid received so far. Governments and organizations that offered help (12) ________that, however.On (13)________Mr. Annan met with world leaders in Jakarta, Indonesia to discuss aid for (14)________. The leaders discussed and (15)________the idea of (16)________owed by affected nations. But the leaders did not say they would do so. Some said that (17)________to survivors would be more helpful.Representatives of (18)________countries and international organizations attended the meeting in Jakarta. Officials say they will cooperate to develop (19)________ for the Indian Ocean and the (20)________.
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