有十张纸币,里面有十元和五元,如果全部加起来有七十元,里面有几张十元和五元

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• 有十张纸币,里面有十元和五元,如果全部加起来有七十元,里面有几张十元和五元
• 英语翻译What is a librarian?A person who sit s at a little desk,talking in a very low voice,taking books from people who brings them back,making them pay if they have them too long ,and stamping the date on books that are taken out?Certainly not!That is the work of the most junior employee in the library.To became a qualified librarian,you first have to work in a library school,usually for two years.If you pass your exams successfully,you may apply for a
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