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【简答题】
试述潮式呼吸的发生机制。
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【简答题】听力原文： I tried this pair of shoes and I think I like this colour and style. Please pack them. By the way, I notice that all the goods in your shop are at 20% discount. And this price tag says ￡20 a pai...
【单选题】关于力和力的投影，下列哪种说法是正确的( )
A.
力是矢量，力的投影是代数量
B.
力是代数量，力的投影是矢量
C.
力和力的投影都是矢量
D.
力和力的投影都是代数量
【简答题】听力原文：I tried this pair of shoes and I think I like this color and style. Please pack them. By the way, I notice that all the goods in your shop are at 20% discount. And this price tag says 20 pounds a...
【简答题】按出现率多少排列，国人阑尾常见的位置有______、______、______、______、______，此外少数人可有______阑尾、______阑尾或______阑尾等。
【简答题】阑尾的常见位置，怎样寻找阑尾？
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