题目内容
18. One young customer paid the company for a job placement in Canada, but he didn’t have a job on his arrival
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19. The company makes money by making arrangements for young people to travel and work mainly in English-speaking countries.
20. An OFT director promised to continue checking on the company and take action against it if there is a significant increase in customers’ complaints again.
误差为衡量（）的标准？
以下各项措施中，可以减小随机误差的是哪种？（ ）
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