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氨基酸通过 连接形成蛋白质,核苷酸通过 连接形成核酸,DNA分子中碱基对通过 连接在一起。
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【简答题】关于推导式,下面哪种说法是错误的A. squared = {x**2 for x in [1, 1, 2]} 是一个集合推导式 B. mcase = {'a': 10, 'b': 34, 'A': 7, 'Z': 3}
mcase_frequency = { k.lower(): mcase.get(k.lower(), 0) + mcase.get(k.upper(), 0) for k in...
【简答题】How did the author become a leader? Read the whole text and fill in the blanks. 1. She used to be a shy and meek person, not “leader material.” Then she knew she needed to ___________. 2. She started ...
【简答题】阅读短文 , 根据文章内容从下列各题的三个选项中选出一个最佳答案。 Paul got on a bus to go to town. It was very crowded, and he had to stand for about five minutes. Then some of the passengers ( 乘客 ) got off. Paul sat down next to a ...
【简答题】(二) Have you ever heard of a girl of 15, who set up a company of her own? Wendy Wong is the girl. She started the business two years ago. She has already written several successful computer s. The...
【简答题】Have you ever heard of a girl of 15, who set up a company of her own? Wendy Wong is the girl. She started the business two years ago. She has already written several successful computer s. They ar...
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