Just under a year ago, a sharp drop in equatorial Pacific sea-surface temperature indicated the end of the 1997~1998 E1 Nino. Called by someone "the climate event of the century", it was by several measures the strongest on record. (41)______.This is more than simply an academic question: the 1997~1998 E1 Nino severely disrupted global weather patterns and Pacific marine ecosystems, and by one estimate caused $033 billion in damage and cost 23,000 lives worldwide. (42)______.Clearly we have much to learn from this experience.
(43)______.Now E1 Nino more generally refers to a warming of the tropical Pacific basin that occurs roughly every three to seven years in association with a weakening of the trade winds. The opposite side of El Nino, La Nina, is characterized by stronger-than-normal trade winds and unusually cold sea-surface temperatures in the tropical Pacific. Both E1 Nino and La Nina are accompanied by swings in atmospheric pressure between the eastern a
某公司网上销售管理系统的数据库部分关系模式如下所示。其中,客户号唯一标识一位客户,产品号唯一标识一件产品,订单号唯一标识一份订单。一份订单必须且仅对应一位客户,一份订单可由一到多条订单明细组成,一位客户可以有多份订单。
客户(客户号,姓名,性别,地址,邮编)
产品(产品号,名称,库存,单价)
订单(订单号,时间,金额,客户号)
订单明细(订单号,产品号,数量)
订单关系模式的主键为 (40) ;订单明细关系模式的主键为 (41) ;其中订单的外键为 (42) 。
Before the 20th century the horse
provided day to day transportation in the United States. Trains were used only
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A.正确 B.错误 [简答题]4.65Q/HN-l-0000.08.051-2015«中国华能集团公司电力设备维护标准化管理实施导则(试 行)》规定,针对一二三类缺陷,基层企业消缺结束时间分别为多长时间?
[多选题] 下列哪些规范性文件可以设定行政处罚
A.法律 B.法规 C.规章 D.规章以下规范性文件 我来回答: 提交
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