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5.设函数6ec8aac122bd4f6e                   (    )

       A.3                        B.4                        C.7                        D.9

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4.已知6ec8aac122bd4f6e的                                                (    )

       A.充分而不必要条件                             B.必要而不充分条件

       C.充分必要条件                                    D.既不充分也不必要条件

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       C.是6ec8aac122bd4f6e的图象               

       D.以上说法都不对

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       B.是6ec8aac122bd4f6e的图象

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       A.是6ec8aac122bd4f6e的图象                            

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

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2.设复数6ec8aac122bd4f6e是实数,则实数6ec8aac122bd4f6e

                                                                                                                                                                                                                                                            (    )

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       C.6ec8aac122bd4f6e                             D.6ec8aac122bd4f6e

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       A.6ec8aac122bd4f6e                                                               B.6ec8aac122bd4f6e

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