NDA标准样品是成功应用NDA技术的关键，几乎所有的NDA仪器和方法需要标准样品来进行效率刻度和各种响应校正。
NDA standards are an essential part of successful application of NDA techniques, almost NDA instruments and methods require standards to make efficiency calibration and various response corrections.
BOD5是一个复杂的生化过程，受到许多客观环境因素的影响，如样品温度、环境温度、搅拌速度，仪器校正等。
BOD5 has a complicated biochemical process and is affected by many external factors such as the sampled water temperature, environmental temperature, stir speed, and instruments verification.
BOD5是一个复杂的生化过程，受到许多客观环境因素的影响，如样品温度、环境温度、搅拌速度，仪器校正等。
BOD5 has a complicated biochemical process and is affected by many external factors such as the sampled water temperature, environmental temperature, stir speed, and instruments verification.
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