分析多参数水质测定仪测定水中BOD5的影响因素，并对各影响因素的不确定度进行计算和评定。结果表明影响其测量不确定度的主要因素是测量重复性的不确定度，其它因素是次要的。%We analysed influencing factors in determining BOD5 in water with multi parameter water quality tester and calculated and evaluated uncertainty of each influencing factor. The result showed that the main factor influencing uncertainty was repeatability.
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