如图所示电路,R1=20欧,电流表A1的读数为0.4安,闭合开关S,电流表A2的

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问题:

如图所示电路,R1=20欧,电流表A1的读数为0.4安,闭合开关S,电流表A2的读数为0.6安,电源电压为_________伏, R2的阻值是___________欧。

考点:欧姆定律及其应用
题型:填空题

UPDATE语句的功能是______。

A.属于数据定义功能

B.可以修改表中列的内容

C.属于数据查询功能

D.可以修改表中列的属性

题型: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)________.

题型:填空题

请叙述链条炉排锅炉点火操作程序的内容。

题型:填空题

资料1

上海和氏化工有限公司(3122260494)为生产所需委托广州市涂料化学品有限公司 4401963068)(NCMINTERNATIONAL CO.LTD)进口法定计量单位为“千克”的润滑剂 EMKARATE)。进口通关单号为310051205097894。1升约等于0.9906公斤,申报时不足1公斤的按四舍五入计算到公斤。

(二)资料2

中华人民共和国海关进口货物报关单

请根据以上资料,选择以下栏目正确选项:

“原产地(地区)”栏()。

A.法国

B.荷兰

C.法国

荷兰

D.法国

法国

题型:填空题

前向SCH的速率申请由哪些因素所决定?

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