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生态循环
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生态循环
在生态系统中,物质从环境开始,经生产者、消费者和分解者,最后回到环境中去,完成一个从简单无机物到有机复合物,最终又回到简单无机物的过程。
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feeding variation of fish
feeding water pipe of boiler
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feeding zone
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feedstuffs ingredients of aquatic animal
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