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【简答题】
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【简答题】函数y= 2cosx-1 cosx+3 的值域是______.
【单选题】已知命题:p:?x∈R,cosx≤1,则¬p为(  )
A.
?x∈R,cosx≥1
B.
?x∈R,cosx≥1
C.
?x∈R,cosx>1
D.
?x∈R,cosx>1
【简答题】《中华人民共和国循环经济促进法》规定,县级以上人民政府应当建立发展循环经济的目标责任制,采取( )等措施,促进循环经济发展。
【单选题】若 1+cosx 1-cosx - 1-cosx 1+cosx =- 2 tanx ,则角x为第(  )象限的角.
A.
(1)(2)
B.
(3)(4)
C.
(1)(4)
D.
(2)(3)
【单选题】命题p:?x∈R,cosx>1的否定是(  )
A.
¬p:?x∈R,cosx≤1
B.
¬p:?x∈R,cosx≤1
C.
¬p:?x∈R,cosx<1
D.
¬p:?x∈R,cosx<1
【简答题】阅读理解。 It was Sports Day at School. There were many races. Lots of parents were watching the children. There was a large crowd of people. Some girls were talking about the races. They were talking abou...
【简答题】函数y= 3cosx+1 cosx+2 的值域是______.
【简答题】She must be very tired. _______so many little childrenis a very hard job. A. To have looked after    B. Having lookedafter     B. Look after   D. Looking after
【单选题】80北京天坛由四组建筑组成,其中用于祭天的建筑是( )。
A.
圜丘坛
B.
祈年殿
C.
皇穹宇
D.
斋宫
【简答题】命题“?x∈R,cosx≤1”的否定是(  ) A.?x∈R,cosx≥1 B.?x∈R,cosx>1 C.?x∈R,cos≥1 D.?x∈R,cosx>1
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