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男性，30岁，因受凉后出现畏寒、发热，咳铁锈色痰，伴左侧胸痛。K线胸片左下肺大片密度增高阴影。 肺足球菌肺炎容易并发
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在评价两个相互排斥的投资方案时应该着重比较其各自的内含报酬率。（）
写信人姓名及地址：Wang Zhigang，Nanhai Textiles Import ＆ Export Inc.，32 Fuxing Road，Beijing 100859，P．R．China收信人及地址：Manager of Chicago Clothes Inc.，1578 Morton Ave.，Chicago，IL. 60053，U．S．
How to Write an AbstractThe rules for writing an abstract (摘要) are almost the same to those for writing the summary of an investigation report. In an abstract you make an outline of the problem and the purpose of your investigation, mention very briefly how you conducted the investigation or tests, describe your main findings, and make the conclusions. All these must be done in as few words as possible: ideally, your abstract will be about 125 words long and never more than 250 words.From the abstract, readers must be able to decide whether the information you provide in the scientific paper or report is particularly interesting to them and whether they should read further. Because a scientific paper is written for readers who generally are familiar with your technical or scientific discipline (学科), you may use technical terminology (术语) in the abstract. The abstract should be written last, when the Whole paper has been written, so that you can make an abstract of the brief details you need from what you have already written. When should you write the abstract After you have finished（）.
某公司购入一批价值20万元的专用材料，因规格不符无法投入使用，拟以15万元变价处理，并已找到购买单位。此时，技术部门完成一项新产品开发，并准备支出50万元购入设备当年投产。经化验，上述专用材料完全符合新产品使用，故不再对外处理，可使企业避免损失5万元，并且不需要再为新项目垫支流动资金。因此，在评价该项目时第一年的现金流出应按65万元计算。（）
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