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已知正数xy满足6ec8aac122bd4f6e的最大值为                                              (    )

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

 

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正项等比数列6ec8aac122bd4f6e的前n项和为6ec8aac122bd4f6e,且6ec8aac122bd4f6e6ec8aac122bd4f6e则公比q等于                            (    )

       A.6ec8aac122bd4f6e                    B.2                        C.6ec8aac122bd4f6e                  D.4、

 

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下列函数中,以6ec8aac122bd4f6e为最小正周期的偶函数,且在6ec8aac122bd4f6e上为减函数的是                (    )

       A.6ec8aac122bd4f6e                          B.6ec8aac122bd4f6e

       C.6ec8aac122bd4f6e                                        D.6ec8aac122bd4f6e

 

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如果执行右侧的程序框图,那么输出的S的值为(    )

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       A.2450                                                  B.2550

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如图,一个空间几何体的正视图、侧视图、俯视图为全等的等腰直角三角形,如果直角三角形的直角边长为1,那么这个几何体的体积为                                                 (    )

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       A.1                                                       B.6ec8aac122bd4f6e

       C.6ec8aac122bd4f6e                                                      D.6ec8aac122bd4f6e

 

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