【单选题】已知全集U=R,A?U,B?U,如果命题P: 2 ∈A∪B ,则命题非P是( )
【简答题】Ellen: They‘re showing Titanic on Channel 2. Jack: But we’ve already seen it, Ellen. Ellen: Yes, but I‘d like to see it again, Jack. Jack: When does it start? Ellen: It starts at half past eight and f...
【单选题】Photoshop CS6中文版控制面板:在Photoshop CS6中课通过“”菜单对不同的控制面板选择并进行编辑( )。
【简答题】5 Complete the text. My
cousin has just written a reference book. He’s not ► well known, but he’s
a good (1) a ____. His book might attract a lot of (2) a ____ because it’s
called ‘How to make a l...
【简答题】It’s often true that jobs for students sometimes lead to employment after graduation, so it’s a good idea to think carefully before you begin working during your college years. During my entire colleg...
【简答题】已知U=R,集合A{x|x<或x>2},则CUA= (A)(-2,2) (B)(-∞,-2)U(2,+∞) (C)[-2,2] (D)(-∞,-2]U[2,+∞)
【简答题】(1)当a=0时,求 (C U A)B; (2)若(C U A)B恰有2个元素,求a的取值范围