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【背景材料】 中国A集团有限公司打算上马一建设开发项目，对此集团公司方面欲通过招标方式选聘一家工程咨询单位全面负责此建设开发项目的咨询工作。中国B工程咨询单位准备参加该咨询项目的投标工作。 为此，该单位在投标文件编制阶段进行了如下工作： 1．投标文件编制准备工作 (1)认真填报，及时递交资格预审文件，积极争取列入短名单。 (2)编制并主动向招标人提交本咨询单位的实力介绍文件，让招标人充分了解单位实力、水平和信誉。 (3)加强与客户的联系，详细了解客户对咨询服务的要求。 (4)通过各种渠道，尽可能收集与项目有关的信息资料，了解项目所在国家或地区的政治、经济、文化、法律、自然条件等方面的情况。 (5)研究制定初步的投标计划，认真考虑承担咨询任务的专家人选。 2．编制实力介绍文件 (1)介绍咨询单位的背景与机构。 (2)介绍咨询单位的资源情况。 (3)介绍咨询单位的业务与经验。 (4)介绍咨询单位的荣誉和信誉。 3．编制财务建议书 (1)咨询费用估算方法及财务建议书的编制说明。 (2)咨询费用总金额。 (3)咨询人员酬金的估算明细。 (4)可报销费用估算明细。 (5)不可预见费用估算。 (6)附件。1.【问题】 1．该咨询单位在投标文件编制阶段进行的投标文件编制准备工作是否正确若不正确，请说出正确的工作应是什么。 2．该咨询单位在投标文件编制阶段进行的实力介绍文件编制工作是否正确若不正确，请说出正确的工作应是什么。 3．该咨询单位在投标文件编制阶段进行的财务建议书编制工作是否正确若不正确，请说出正确的工作应是什么。
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Agriculture is undoubtedly the most important sector in the economies of most non-oil exporting African countries. It (62) about 30% of Africa’s GDP and contributes (63) 50% of the total export value, (64) 70% of the continent’s population depending on the sector for their (65) . Production is subsistence in nature with a high (66) on the rain. The debate on climate change and its impacts on agriculture is (67) very crucial to the very survival of the continent and its people. The continent is particularly (68) to climate change because it includes some of the world’s poorest nations. The climate in Africa is (69) tropical in nature, which is broadly (70) into three main climatic zones: (71) equatorial, dry, and temperate(温带). Within these zones, altitude and other localized (72) also produce distinctive regional climates. Climate change, (73) indicated by prolonged drought is one of the most serious climatic (74) affecting the agricultural sector of the continent. As most of the agriculture activities in African countries hinges on rain fed, any adverse changes in the climate would likely have a (75) effect on the sector in the region. (76) changes in the climate may affect the whole continent, its (77) may vary across the continent. In northeast Africa, more intense dry periods and shorter wet seasons are expected to affect even huge river systems such as the Blue Nile, leading to serious water shortages and (78) consequences to the agriculture and forestry sectors throughout the region. East and Central Africa will also see its agricultural (79) decline. Coastal areas may also be affected by rising sea levels and intrusion of salt water into inland freshwater resources. The staple food for the region, maize, is particularly susceptible to drought. Wetlands of international importance and wildlife are also under threat from (80) in Southern Africa. Climate change, therefore, is expected to worsen the food supply, (81) , exacerbate the widespread poverty in the region.
人们可以有意识地控制抽样误差的大小，因为可以调整总体方差。（）
点估计是直接用一个样本指标估计总体指标的推断方法。（）
抽样误差的概率度是用来测量估计可靠程度的指标。（）
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