名校
1 . 命题
:
是
的充要条件;命题
:函数
在
不是单调函数,则下列命题是真命题的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3c11ef204e0552a07c7b5a0fdb095bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd5122b1178ff1ddb394907c9de88608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9214539e367939d3f4676758334411d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0a68eadbcb9953c6d7fc17ef2763ce5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
2 . 在正方体
中,点P满足
,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/29/ab39cd57-1b14-49b3-aa69-8c93b5939569.png?resizew=148)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dad8c2a9a3af6b3e161a5b6e84b831b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/29/ab39cd57-1b14-49b3-aa69-8c93b5939569.png?resizew=148)
A.对于任意的正实数![]() ![]() |
B.对于任意的正实数![]() ![]() ![]() |
C.存在正实数![]() ![]() ![]() ![]() |
D.存在正实数![]() ![]() ![]() ![]() |
您最近一年使用:0次
3 . 已知抛物线
的焦点
到准线的距离为4,过
的直线与抛物线交于
两点,
为线段
的中点,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82ea1be9b9b6bb12afa7e1ce703d1603.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
A.抛物线![]() ![]() |
B.当![]() ![]() ![]() |
C.若![]() ![]() ![]() |
D.![]() |
您最近一年使用:0次