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电器火灾属于丙类火.
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女孩，1岁半。主诉：消瘦1年，加重半年，伴食欲差、间断腹泻，就诊。请针对该案例，说明问诊内容与技巧。
4岁男孩，洗澡时母亲发现其右侧阴囊肿大，似有一肿物就医。查体：右侧阴囊处可触及一卵圆形肿物，约2cm×3cm，平卧后消失，透光试验阳性，最可能的诊断为（）
Ravi, like many project (1) , had studied the waterfall model of software development as the primary software life-cycle (2) . He has all set to use it for an upcoming project, his first assignment. However, Ravi found that the waterfall model could not be used because the customer wanted the software delivered in stages, something that implied that the system had to be delivered and built in (3) and not as (4) . The situation in many other projects is not very different. The real world rarely presents a problem in which a standard process, or the process used in a previous project, is the best choice. To be the most situation, an existing process must be (5) to the new problem. A development process, even after tailoring, generally cannot handle change requests. To accommodate change requests without losing control of the project, you must supplement the development process with a requirement change management process.空白（4）处应选择（）
输血有很多危险性，其中下列哪种反应与输入血液抗体的含量有直接关系（）
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