专业英语（水资）- 第3周 - 课前测验
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Which one is the most readily available source of water?
Which source of water is less open to atmospheric pollution?
If dissolved oxygen is not sufficent, bacteria will experience_______conditions.
CO2 is the end-production of _______process.
Rock strata that holds water are known as______.
In a river, ______________ must be maintained to ensure enough oxygen for bacteria to degrade the organic wastes.
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