题目内容
爱因斯坦模型的格波的频率,属于长光学支频率。
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光学格波在低温时对热容的贡献非常大。
由德拜模型计算的晶格振动热容在高温时与理论值不吻合。
Listen and complete. Listen to the passage and fill in the blanks with the words you hear.Tony is driving to the airport to pick up Mrs. Parker from Beijing University. She comes to Guangzhou to 1)an important international conference. The conference will 2)at Sun Yat-sen University from 10th to13th of December. According to 3), Mrs. Parker is going to give a talk on the subject of“Humans and Environment". After the conference,Tony will show her around Guangzhou and take her to taste the 4). On the afternoon of December 13th, he wil 5)at the airport.[音频]
目前技术上成熟并在实际光纤通信系统得到广泛应用的是 调制。
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