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10.“6ec8aac122bd4f6e”是“6ec8aac122bd4f6e”的                                                                      (    )

       A.充分但不必要条件                             B.必要但不充分条件

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

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       A.0                        B.1                        C.2                        D.6ec8aac122bd4f6e

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9.已知n是正整数,6ec8aac122bd4f6e等于                       (    )

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       A.4                        B.8                        C.16                      D.6ec8aac122bd4f6e

 

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8.已知函数6ec8aac122bd4f6e的反函数为6ec8aac122bd4f6e的最小值为

                                                                                                                              (    )

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

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7.已知平面向量6ec8aac122bd4f6e与平面向量6ec8aac122bd4f6e满足6ec8aac122bd4f6e,设向量6ec8aac122bd4f6e的夹角等于6ec8aac122bd4f6e,那么6ec8aac122bd4f6e等于                                                                 (    )

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       C.1:36ec8aac122bd4f6e                                            D.1:(36ec8aac122bd4f6e―1)

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       A.1:6ec8aac122bd4f6e                                              B.1:9

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6.在一个棱锥中,作平行于棱锥底面的截面,截面面积与棱锥底面面积之比为1:3,截面将棱锥截成一个小棱锥P1和一个多面体P2两部分。则P1与P2的体积之比为                         (    )

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