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【判断题】
UPS又称为联合包裹服务公司,起源于美国西雅图一家信差公司。A.
正确
B.
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【简答题】 What is a coronavirus? Coronaviruses are a family of viruses that range from the common cold to MERS coronavirus, which is Middle East Respiratory Syndrome coronavirus and SARS, Severe Acute Respira...
【简答题】So where did the virus c ome from? It's known that corona viruses are in a range of animals, sometimes these4._________ (viruse) can make the jump from animals to humans. This is called a spillover .
【简答题】Corona viruses can cause a range of symptoms, what are they? F ever
【简答题】设 n 是, Sn 是 n 的正因子的集合. D 为整除关系,问偏序集是否构成格?
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