There are many letter combinations that can be pronounced as /eə/, such as are, ar, air, are, ear, etc.
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Diphthongs are sounds which consist of a movement or glide from one vowel to another, and the shape of the mouth makes changes from the beginning of the sound to the end.
A. 对
B. 错
There are 3 centring diphthongs in English, and they are /ɪə/, /eə/, /ʊə/.
A. 对
B. 错
应用高斯定理求解静电场要求电场具有什么样的分布?
A. 线性
B. 对称性
C. 任意
D. 非均匀
“电位的拉普拉斯方程对任何区域都是成立的”,此说法是否正确?
A. 正确
B. 错误
C. 不能判断其正误
D. 仅对电荷密度不为零的区域成立