若(3x-1)7=a7x7+a6x6+…+a1x+a0,则a7+a6+…+a1=

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问题:

若(3x-1)7=a7x7+a6x6+…+a1x+a0,则a7+a6+…+a1=________.

考点:二项式定理与性质
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Kofi Annan says helping survivors of last week’ s earthquake and (1) . in the Indian Ocean is (2) . The United Nations secretary-general says countnes that have offered aid must (3) and provide it. The offers add up to around (4) dollars. Unitd 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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国家标准规定()为普通螺纹的公称尺寸。

A.大径

B.中径

C.小径

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下面关于计算机病毒的一些叙述中错误的是( )。

A.网络环境下计算机病毒往往是通过电子邮件传播的

B.电子邮件是个别的通信手段,即使传播计算机病毒也是个别的,影响不大

C.目前防火墙还无法保障单位内部计算机不受带病毒电子邮件攻击

D.一般情况下只要不打开电子邮件及附件,系统就不会感染它所携带的病毒

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论述消遣型旅游者的需求特点。

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“丧三年、常悲咽”中的三年是根据()而定的

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