試題詳解

8. Which of the following descriptions for metal or heavy metal exposure is/are CORRECT?
(A) Blood and urine concentrations usually are reflective of more recent exposures and correlate with acute adverse effects
(B) Hair can be useful in assessing variations in exposure to metals over the period of its growth
(C) The biological half-lives of arsenic in bone are 20--30 years
(D) The half-life of lead in blood is only a few weeks
(E) After inhalation of mercury vapor, at least two half-lives describe the retention in brain