判断题

线性回归可以用来分类
正确错误

答案：正确

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You were at rest and a police car with its siren on was passing you with a constant speed. You found that the frequencies of the siren were respectively 550Hz and 450Hz when the police car was moving toward and away from you. Assume that the speed of sound in air is 340m/s. The speed of the police car was m/s .(Keep only the integer portion)

答案： 34

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答案：正确