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6．将若干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 Template






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sketch 3149 Dude with a sword by Elio Hernandez
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