题目内容
釉质龋暗层的孔隙容积占釉质体积的
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Listen to the following dialogue and answer the questions that follow. How many people were involved in the conversation?____________ people. (空格处请填入英文数字, 并注意句首字母大小写的要求。)
Listen to the following dialogue and answer the questions that follow. What is the most probable relationship between the speakers: teacher and student, doctor and patient or just friends? ______________.
Among the stop consonants, /p/, /t/ and /k/ are the voiced sounds with the vibrating of the vocal cords.
正态分布不具有（）所述的特征。
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