The effect of fluoride intake from water and air is relatively difficult to monitor.
In general the effect is not likely to be as harmful as the effect of exposure to sulfur dioxide.
An intake of 4 milligrams over a long period of time usually leads to a skeletal disorder in humans.
An intake of slightly more than 4 milligrams for only a few months is not likely to be life-threatening.
答案:17-27:EDCBADEDBDE
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