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According to the professor, how do geologists interpret the presence of erratics in the tr..
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下列各项中，不属于期门穴主治病证的是（)A、胸胁胀痛B、呕吐.....
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What aspect of the Earth 750 million years ago i.....
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患者，男性，80岁，出现便血，伴贫血、腹痛、右下腹肿块1个月.....
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县级以上人民政府农业行政主管部门应当加强对农业投入品使用.....
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What does the professor imply about the use of c.....
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