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       A.6ec8aac122bd4f6e                                 B.6ec8aac122bd4f6e  

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6.若函数6ec8aac122bd4f6e                    (    )

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5.已知数列6ec8aac122bd4f6e是各项均为正数的等比数列,6ec8aac122bd4f6e

                                                                                                                              (    )

       A.2                        B.33                      C.84                      D.189

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       C.若6ec8aac122bd4f6e                 D.若6ec8aac122bd4f6e

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       A.若6ec8aac122bd4f6e                      B.若6ec8aac122bd4f6e

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4.设6ec8aac122bd4f6e是两条不同的直线,6ec8aac122bd4f6e是两个不重合的平面,则下列命题中正确的是 (    )

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3.已知向量6ec8aac122bd4f6e的值为                                  (    )

       A.12                      B.3                        C.-3                       D.-12

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       A.6ec8aac122bd4f6e            B.6ec8aac122bd4f6e                C.6ec8aac122bd4f6e              D.6ec8aac122bd4f6e

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2.抛物线6ec8aac122bd4f6e的准线方程为                                                                            (    )

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       C.6ec8aac122bd4f6e                              D.6ec8aac122bd4f6e

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