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《正气歌》诗云：“在齐太史简，在晋董狐笔。在秦张良椎，在汉苏武节。为严将军头，为嵇侍中血。为张睢阳齿，为颜常山舌。”请问“严将军头”指的是三国时期哪位人士？
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Beads， stones， seashells， paper， precious metals such as gold and silver， base metals such as iron have all been used as money. Today， money is printed on paper. A lot of countries use their own currency， with n ames such as dollar， pound， franc， ruble， yuan and so on. Since 2002， 18 of the EU members have replaced their national currencies by Euro notes and coins. If you want to pay for something in another currency, you have to change your money into the other money. If you want to travel outside your native country, you need to change your own country's money for the money of the country you are visiting. Most large banks sell foreign currencies. You can exchange money at a bank or at an office of a tourist agency Wherever you go, exchanging money puts you in touch with international finance, which is concerned with exchange rates between different currencies. Deciding the rate for the international exchange of money is one of the most complex aspects of international banking. This best title for this passage is The history of money".
材料的导热性与材料的化学组成、（）、孔隙率、孔隙形态特征、含水率及导热时的温度有关
在没有电话的情况下，应大声呼喊或采取其他方法引起邻居、行人注意，协助灭火或者报警。
《艾凡赫》的作者是（）。
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