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Common solid medium of soilless cultivation include（）
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Depending on the fact whether the cultivation beds are applicable to solid medium materials, the soilless cultivation is divided into（）and（）
American scientists_showed the necessity of adding trace elements based on the results of experiments, and released the standard formula of nutrient solution accordingly（）
which theories listed below are based on the pre-assumption of informationally efficient market（）
the Challenges for the Indian banking systems include（）
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