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集中施肥 concentrated fertilization
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A vessel would be referred to as "stiff" when the weight of the cargo is ______.A.evenly distributed vertically and the double bottoms are fullB.concentrated low and the double bottoms are emptyC.concentrated low and the double bottoms are fullD.concentrated high and the double bottoms are empty
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填空题集中施肥体现了土壤()效应。
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