测定水样BOD5,水中有机物含量高时,应稀释水样测定,稀释水要求()
A.pH为7.0,BOD5应小于0.5mg/L B.pH为7.2.BOD5应小于0.5mg/L C.pH为7.5,BOD5应小于0.2mg/L D.pH为7.2.BOD5应小于0.2mg/L正确答案B
测定水样BOD5,水中有机物含量高时,应稀释水样测定,稀释水要求()
A.pH为7.0,BOD5应小于0.5mg/L B.pH为7.2.BOD5应小于0.5mg/L C.pH为7.5,BOD5应小于0.2mg/L D.pH为7.2.BOD5应小于0.2mg/L正确答案B