朗读下列句子 1. Where shall I register? 2. I want to make a registration for ENT department. 3. Have you ever been here before. 4. You have to open a medical record. 5. I have had a temperature and I feel pain all over.
【简答题】A sample of wastewater is estimated to have a BOD of 200 mg/L. 1) What dilution is necessary for this BOD to be measured by the usual technique? 2) If the initial and final dissolved oxygen of the tes...