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11. 曲线的离心率的取值范围是

A.               B.               C.               D.(0,1)

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10.函的值域是

       A.[0,1]                                                       B.[0,2]

C.[0,]                                                  D.[1,]

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9.展开式中的系数是

A.6                           B.15                          C.                        D.

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8.正四棱锥的底面边长等于,侧面与底面成60°的二面角,此四棱锥体积为

A.9                           B.12                          C.15                          D.18

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7.曲线在点(0,1)处的切线与直线垂直,则

A.                         B.                         C.                       D.

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6.已知实数、同时满足三个条件:①;② ;③ ,则的

   最小值等于

A.3                        B.4                         C.5                          D.6

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5.若,则

A.                                                 B.

C.                                                D.

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4.函数的图象

A.关于轴对称                                           B.关于轴对称

C.关于直线对称                                  D.关于坐标原点对称

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3.原点到直线的距离等于

A.1                           B.2                            C.3                            D.4

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2.设集合,则

A.{,0}                                                  B.{0,1,2}

C.{,0,1}                                             D.{,,0,1,2}

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