A.<0.3mg/L B.0.4~0.6mg/L C.0.7~1.0mg/L D.1.5mg/L E.2~4mg/L 能引起慢性氟中毒的氟浓度是

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问题 A.<0.3mg/L
B.0.4~0.6mg/L
C.0.7~1.0mg/L
D.1.5mg/L
E.2~4mg/L
能引起慢性氟中毒的氟浓度是

选项 A、 
B、 
C、 
D、 
E、 

答案E

解析
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