题目内容
Only sound in the range of () frequency can be felt by the ear, that is, it can cause hearing.
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Anthropometric data is often expressed in percentiles, with the most commonly used percentiles of the 5%, ( ) % and 95%.
People tend to understand and perceive the objects of reality according to the knowledge and experience they have acquired in the past, which is the () of human perception.
Given that binary quadratic form F(X)= 1/2xtax, and A=[1, 2; 2,4], the quadratic form is ().
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