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【简答题】
什么是一对一映射?什么是多对一映射?什么是多对多映射?请举出实际生活中的例子。
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反馈参考答案：
举一反三
【简答题】第二心音分裂由（）所致，在（）较明显。
【单选题】Why does the father object to Joyce's idea of buying Adidas?
A.
He thinks Adidas would cost him quite a lot of money.
B.
He doesn't think Joyce will run.
C.
He doesn't think the shoes will help Joyce in the games.
D.
He doesn't think Joyce will play sports for long.
【简答题】中国书法作为汉字书写的艺术,具有非常悠久的历史。它是中国艺术的最高形式之一,既能传达思想,又能展示线条抽象的美感。人们还普遍认为,练能够使人保持身体健康。中国历史上的书法家多有长寿之辈,也证明了这一说法。人们在练时全神贯注,被书法作品的魅力深深吸引,从而对令人不快的事情视而不见,听而不闻,取而代之的是一种平静和轻松,以及一种舒适依然的心理状态,这对身心大有裨益。
【多选题】Which statements are true about Adidas?
A.
According to Statistica, Adidas employs just over 60,000 people worldwide.
B.
It actually has more factories than Nike does, with 1,000 independent factories in 60 countries.
C.
Adidas sells around 250 million pairs of shoes a year.
D.
We can find any sources for the total number of Adidas products sold.
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