回复Insm_c56b28ac发表于:2020/7/17 9:35:58悬赏金额:
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昨日测水中氨氮样品。取样量为25mL,稀释2倍。测得稀释样品浓度为0.8877mg/L,空白浓度为0.1602mg/L。计算结果是0.8877*2-0.1602还是0.8877*2-0.1602*2.
[img=,690,517]https://ng1.17img.cn/bbsfiles/images/2020/07/202007170932261614_9206_3429358_3.jpg!w690x517.jpg[/img][img=,690,517]https://ng1.17img.cn/bbsfiles/images/2020/07/202007170934069471_6163_3429358_3.jpg!w690x517.jpg[/img]