题目内容
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。
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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。
由于激光器内部不均匀增益或不均匀吸收，在 P-I 曲线扭折区域，输出光脉冲出现持续等幅的高频振荡，这种现象称为 现象。
在下列数字光纤通信系统的传输码型中，不属于插入比特码的是。
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