题目:
在1万平方公里的海域中有40平方公里的大陆架贮藏着石油,假若在海域中任意一点钻探,那么钻到油层面的概率是( )
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答案:
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College students have a few ways to pay their college fees. Many students have their parents to pay the fees. Some students may apply for a bank loan and others will ...