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http://picflow.koolearn.com/upload/papers/20140823/20140823122333075201.gif为第二象限角,那么 http://picflow.koolearn.com/upload/papers/20140823/20140823122333122396.gifhttp://picflow.koolearn.com/upload/papers/20140823/20140823122333122324.gifhttp://picflow.koolearn.com/upload/papers/20140823/20140823122333137339.gifhttp://picflow.koolearn.com/upload/papers/20140823/20140823122333168358.gif中,其值必为正的有 (  )

发布时间:2021-07-21

A.http://picflow.koolearn.com/upload/papers/20140823/20140823122333184197.gif

B.http://picflow.koolearn.com/upload/papers/20140823/20140823122333200134.gif

C.http://picflow.koolearn.com/upload/papers/20140823/20140823122333215190.gif

D.http://picflow.koolearn.com/upload/papers/20140823/20140823122333231187.gif

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