單項(xiàng)選擇題飲水的適宜氟濃度一般應(yīng)保持在()

A.2.1~2.5mg/L
B.1.6~2.0mg/L
C.1.1~1.5mg/L
D.0.5~1.0mg/L
E.0.1~0.4mg/L


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