Which of the following statements is true for groundwater self-purification?单项选择题

A

Contaminants are diluted easily, but not washed out effectively.

B

Contaminants are washed out rapidly but warm temperatures usually slow down reactions.

C

Contaminants are not washed out or rapidly diluted and lower concentrations of dissolved oxygen exist for decomposition.

D

Contaminants wash out rapidly but lower concentrations of dissolved oxygen exist for decomposition.

E

Contaminants are easily volatilized and diluted but not washed out rapidly, and temperatures are too warm

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