The table below gives DDT levels in parts per million(ppm),f
4个回答
a)陈列出在不同地区的鸟蛋中农药指标的区别.
b)在1972年至1984年之间指标有什么浮动.为什么会有这些浮动?
c)指出在不同种类的鸟蛋中农药指标的区别,为什么会有这些区别?
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