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下列各小题中,p是q的充要条件的是( ) (1)p:m6;q:y=x 2 +mx+m+3有两个不同的零点. (2)p: =1;q:y=f(x)是偶函数. (3)p:cosα=cosβ;q:tanα=tanβ. (4)p:A∩B=A;q: B? A. (A)(1)(2) (B)(2)(3) (C)(3)(4) (D)(1)(4)
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