19. The company makes money by making arrangements for young people to travel and work mainly in English-speaking countries.
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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?
A. 准确度
B. 精密度
C. 置信度
D. 精确度
以下各项措施中,可以减小随机误差的是哪种?( )
A. 进行仪器校准
B. 做对照试验
C. 增加平行测定次数
D. 做空白实验
做对照试验的目的是()?
A. 检查系统误差是否存在
B. 使实验精密度提高
C. 消除随机误差
D. 减小标准偏差