In the procedure, the sample needs generally no pre-treatment and can be determined directly.
测定时，水样一般无需前处理，可直接测定。
The sample flow must be at the same value of the previous calibration procedure.
样品流量必须与校验时的流量值相一致。
The sample flow must be at the same value of the previous calibration procedure.
样品流量必须与校验时的流量值相一致。
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