将若干只家蝇按一定的雌雄比例分成ab两组.a组家蝇用一定浓度的ddt处理b组家蝇不用ddt处理.喂养一段时间后观察并比较�现a组家蝇的 Template




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tomski将若干只家蝇按一定的雌雄比例分成ab两组.a组家蝇用一定浓度的ddt处理b组家蝇不用ddt处理.喂养一段时间后观察并比较�现a组家蝇的 coloring