单项选择题
水样中的重金属主要指( )等生物毒性显著的元素。
A、汞、镉、铅、铬、镍
B、汞、镉、铅、铬、铝
C、钙、镉、铅、铬、镍
D、铁、镉、铅、铬、镍
水样中的重金属主要指( )等生物毒性显著的元素。
A、汞、镉、铅、铬、镍
B、汞、镉、铅、铬、铝
C、钙、镉、铅、铬、镍
D、铁、镉、铅、铬、镍
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