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根据《长途光缆波分复用（WDM）传输系统工程验收规范》，（）对工程试运转过程中出现的施工质量问题负责保修。
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Headhunters or executive search firms specialize in finding the right person for the right job. When a company wishes to recruit a new person for an important position， it may use the services of such a firm. The advantages for the employer are that it does not have to organize the costly and time-consuming process of advertising， selecting and interviewing suitable applicant. In some cases， the search firm may already have a list of people with the appropriate skills for the job. If this is not the case， then it may act as a consultant， advising or even organizing tests and simulations to evaluate candidates’ behavior in order to select the most competent person for the job.The passage mainly talks about the increased business of headhunters.
海南岛平均海拔是多少米（）
入射角大于临界角产生不了透射波。
基本保障机制包括（）、（）和（）。
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