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千代田区の環境...①河川水質の経年変化 H22 H23 H24 H25 H26 H27 H28 H29 H30 H31・R1 透視度 ( ) 92 83 90 93 100 62 80 100 100 69 水素イオン濃度 pH 7.2 7.0
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