欧美日韩黄网欧美日韩日B片|二区无码视频网站|欧美AAAA小视频|久久99爱视频播放|日本久久成人免费视频|性交黄色毛片特黄色性交毛片|91久久伊人日韩插穴|国产三级A片电影网站|亚州无码成人激情视频|国产又黄又粗又猛又爽的

函數(shù)在＝        處取得極小值．

在△ABC中，∠C＝900，AC＝4，則＝          。

已知方程在上有兩個不同的解，（＜），則下面結(jié)論正確的是 (　　)

A．                  B． 

C．                  D．

定義域?yàn)镽的偶函數(shù)滿足對，都有成立，且當(dāng)[2，3]時，．若函數(shù)在上至少有三個零點(diǎn)，則的取值范圍是（  ）

A．         B．        C．           D．

函數(shù)的圖象大致是(　　)

 設(shè)p、q是兩個命題，p ：＞0， q ：＞0，則p是q的（    ）

A．充分而不必要條件    B．必要而不充分條件     C．充要條件     D．既不充分也不必要條件

由曲線圍成的封閉圖形面積為 (　　)

A．           B．          C．                D．

設(shè)，，，則（    ）

A．a(chǎn)＜b＜c          B．b＜a＜c           C．b＜c＜a          D．a(chǎn)＜c＜b

數(shù)列的前項和為，若，則＝(　　)

A． 1                B．                 C．              D．

已知角的頂點(diǎn)與原點(diǎn)重合，始邊與x軸的正半軸重合，終邊在直線y ＝2 x上，則  （　　�。�                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  

A．                B．               C.               D．