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原始髓木目
出现于早石炭世,以茎干解剖中包含双向形成层和拥有裸子植物的繁殖器官为主要特征的一类植物化石。
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energy randomization
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energy resolution power
energy resource map
energy resources of China
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energy-saving and low-carbon technology
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energy-saving control of sensors
energy saving glass
energy saving in aquaculture hothouse
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