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【单选题】
如图所示， 是定义在区间 （ ）上的奇函数，令 ，并有关于函数 的四个论断： ①若 ，对于 内的任意实数 （ ）， 恒成立； ②函数 是奇函数的充要条件是 ； ③若 ， ，则方程 必有3个实数根； ④ ， 的导函数 有两个零点； 其中所有正确结论的序号是(    )．
A.
①②
B.
①②③
C.
①④
D.
②③④
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A.
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A.
有明显区域性
B.
有明显季节性
C.
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A.
Opium is closely related with the economy situation of Afghanistan people.
B.
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D.
It is a problem left by history and it need more patience.
查看完整题目与答案
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B.
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believes there is hope for peace.
B.
will report to the UN on Thursday.
C.
will hold more talks before leaving the region.
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is not sure that the peace process will succeed.
查看完整题目与答案
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有明显的季节性
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受人类经济活动的影响
D.
有特定的传播方式
查看完整题目与答案
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A.
Opium is closely related with the economy situation of Afghanistan people
B.
It is a hard job which needs time
C.
Afghanistan is not a democratic country
D.
It is a problem left by history and it need more patience
查看完整题目与答案