【单选题】【消耗次数：1】
，是函数在点处取得极值的（）
①
必要条件
②
充要条件
③
充分条件
④
无关条件
参考答案：
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相关题目
【单选题】
方阵A可逆的充要条件是
①
<img class=jc-formula data-tex=A\neq 0 src=https://huaweicloudobs.ahjxjy.cn/320176A89C56562C9EE6EF9E59F144B4.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex={ A }^{ * }\neq 0 src=https://huaweicloudobs.ahjxjy.cn/86C2FE4B86A988E3BB004472D39EBA7F.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=\left| A \right| \neq 0 src=https://huaweicloudobs.ahjxjy.cn/DDF5A5E8A4C1CB242AB871222A74D4F9.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=\left| A \right| =0 src=https://huaweicloudobs.ahjxjy.cn/C0FF5500641DFC6CB166CD5F7867609E.png style=vertical-align: middle;/>
随机题目
【单选题】
当直线、平面与投影面平行时，该投影面上的投影具有( )
①
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
/* Style Definitions */
table.MsoNormalTable
{mso-style-name:普通表格;
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-priority:99;
mso-style-parent:"";
mso-padding-alt:0cm 5.4pt 0cm 5.4pt;
mso-para-margin:0cm;
mso-para-margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:10.5pt;
mso-bidi-font-size:11.0pt;
font-family:等线;
mso-ascii-font-family:等线;
mso-ascii-theme-font:minor-latin;
mso-fareast-font-family:等线;
mso-fareast-theme-font:minor-fareast;
mso-hansi-font-family:等线;
mso-hansi-theme-font:minor-latin;
mso-font-kerning:1.0pt;}
积聚性
②
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
/* Style Definitions */
table.MsoNormalTable
{mso-style-name:普通表格;
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-priority:99;
mso-style-parent:"";
mso-padding-alt:0cm 5.4pt 0cm 5.4pt;
mso-para-margin:0cm;
mso-para-margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:10.5pt;
mso-bidi-font-size:11.0pt;
font-family:等线;
mso-ascii-font-family:等线;
mso-ascii-theme-font:minor-latin;
mso-fareast-font-family:等线;
mso-fareast-theme-font:minor-fareast;
mso-hansi-font-family:等线;
mso-hansi-theme-font:minor-latin;
mso-font-kerning:1.0pt;}
真实性
③
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
/* Style Definitions */
table.MsoNormalTable
{mso-style-name:普通表格;
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-priority:99;
mso-style-parent:"";
mso-padding-alt:0cm 5.4pt 0cm 5.4pt;
mso-para-margin:0cm;
mso-para-margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:10.5pt;
mso-bidi-font-size:11.0pt;
font-family:等线;
mso-ascii-font-family:等线;
mso-ascii-theme-font:minor-latin;
mso-fareast-font-family:等线;
mso-fareast-theme-font:minor-fareast;
mso-hansi-font-family:等线;
mso-hansi-theme-font:minor-latin;
mso-font-kerning:1.0pt;}
类似收缩性
④
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
/* Style Definitions */
table.MsoNormalTable
{mso-style-name:普通表格;
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-priority:99;
mso-style-parent:"";
mso-padding-alt:0cm 5.4pt 0cm 5.4pt;
mso-para-margin:0cm;
mso-para-margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:10.5pt;
mso-bidi-font-size:11.0pt;
font-family:等线;
mso-ascii-font-family:等线;
mso-ascii-theme-font:minor-latin;
mso-fareast-font-family:等线;
mso-fareast-theme-font:minor-fareast;
mso-hansi-font-family:等线;
mso-hansi-theme-font:minor-latin;
mso-font-kerning:1.0pt;}
收缩性
【单选题】
mso-bidi-font-family:宋体;mso-font-kerning:0pt;mso-ansi-language:EN-US;
mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA;mso-bidi-font-weight:bold">平行剖切面剖视图所用的剖切平面是
①
一个剖切平面
②
两个相交的剖切平面
③
两个剖切平面
④
几个平行的剖切平面
【单选题】
带切口三棱锥的三视图正确的是<img src="https://file.icve.com.cn/ssykt/612/1019/993FEC45F09DCEE161CBCB1E01C2CC55.png"/>
①
<img src="https://file.icve.com.cn/ssykt/182/242/2D93C9C0D7E7C1DB10E4A19FFB151032.png">
②
<img src="https://file.icve.com.cn/ssykt/806/563/C988CDCABF9549CBA1EF8D59C4196DAD.png">
③
<img src="https://file.icve.com.cn/ssykt/781/281/C344661011811700A3609B4D1742E2F6.png">
④
<img src="https://file.icve.com.cn/ssykt/469/867/757D8D6A89B8454C01577E33C252B1AA.png">