【判断题】【消耗次数：1】
敬语正确使用：加强修养、恰当使用、养成习惯
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正确
②
错误
参考答案：
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相关题目
【单选题】
学前儿童养成良好的用眼习惯，以下说法正确的是（ ）
①
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②
Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE MicrosoftInternetExplorer4 /* 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-qformat:yes; 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:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:宋体; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; mso-font-kerning:1.0pt;} Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE MicrosoftInternetExplorer4 /* 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-qformat:yes; 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:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:宋体; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; mso-font-kerning:1.0pt;}在阅读和写字时，光线应从后方照入
③
Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE MicrosoftInternetExplorer4 /* 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-qformat:yes; 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:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:宋体; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; mso-font-kerning:1.0pt;} Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE MicrosoftInternetExplorer4 /* 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-qformat:yes; 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:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:宋体; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; mso-font-kerning:1.0pt;}只要保持正确的看书姿势，长时间的阅读并不会导致儿童眼睛疲劳
④
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【单选题】
学前儿童养成良好的用眼习惯，以下说法正确的是（ ）
①
Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable
【单选题】
学前儿童养成良好的用眼习惯，以下说法正确的是（ ）
①
Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable
【单选题】
使用含氟牙膏防龋，正确的是
①
氟牙膏的防龋功效与含氟浓度的高低无关
②
在饮水含氟量高的地区，7岁以下儿童推荐使用含氟牙膏
③
儿童使用含氟牙膏不会引起氟牙症
④
老年人不宜使用含氟牙膏
⑤
6岁以下的儿童宜使用含氟浓度低的牙膏
随机题目
【单选题】
行列式<img class=jc-formula data-tex=D=\left| 4\quad \quad 1\quad \quad 0\\ 3\quad -2\quad \quad a\\ 6\quad \quad 5\quad -7 \right| \\ src=https://huaweicloudobs.ahjxjy.cn/8727897293C31A06FA00AC0A5F615713.png style=vertical-align: middle;/>中，元素<img class=jc-formula data-tex=a src=https://huaweicloudobs.ahjxjy.cn/9E6811B01809881CF07AD693672263CD.png style=vertical-align: middle;/>的代数余子式是
①
<img class=jc-formula data-tex=\left| 4\quad \quad 0\\ 6\quad -7 \right| src=https://huaweicloudobs.ahjxjy.cn/1C674BB3D47CFA2C1A454476181216CC.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=\left| 4\quad 1\\ 6\quad 5 \right| src=https://huaweicloudobs.ahjxjy.cn/5E37393851287E1E0915F3AFFC07CD72.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=-\left| 4\quad \quad 0\\ 6\quad -7 \right| src=https://huaweicloudobs.ahjxjy.cn/E01C981D7CD671A5924C1859E87ED793.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=-\left| 4\quad 1\\ 6\quad 5 \right| \\ src=https://huaweicloudobs.ahjxjy.cn/1B3B97A7ED74CD3F2DDF532E838C026F.png style=vertical-align: middle;/>
【单选题】
设A为任意n阶方阵，下列为反对称阵的是
①
<img class=jc-formula data-tex=A+{ A }^{ T }\quad src=https://huaweicloudobs.ahjxjy.cn/E8E44E3D91733E61D1AAACA8DF0137FA.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=A{ A }^{ T }\quad src=https://huaweicloudobs.ahjxjy.cn/C1C3373CBFF9195C3C062F0C4C00B832.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=A-{ A }^{ T }\quad src=https://huaweicloudobs.ahjxjy.cn/560CE8F0003F4EC4E0D71FB37F459F38.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex={ A }^{ T }A\quad \quad src=https://huaweicloudobs.ahjxjy.cn/AA6CA794CCBFD4DCFA39C7AA056FEC7F.png style=vertical-align: middle;/>
【单选题】
设<img class=jc-formula data-tex=A,B,C src=https://huaweicloudobs.ahjxjy.cn/EC933A64D7636439DA6D94835FDBF83C.png style=vertical-align: middle;/>均为n阶方阵，且AB=BA,AC=CA,则ABC=
①
ACB
②
CBA
③
CAB
④
BCA
【单选题】
设<img class=jc-formula data-tex=R({ A }_{ 4\times 6 })=2 src=https://huaweicloudobs.ahjxjy.cn/001149D0545130C3A9616B572DCD538A.png style=vertical-align: middle;/>，则齐次线性方程组AX=0的基础解系中所含向量的个数是
①
1
②
2
③
3
④
4
【单选题】
<img class=jc-formula data-tex=\begin{ pmatrix } 1 3 \\ 1 4 \end{ pmatrix } src=https://huaweicloudobs.ahjxjy.cn/4DBB69567C31724E234F423DFF4F1E23.png style=vertical-align: middle;/>的逆矩阵为
①
<img class=jc-formula data-tex=\begin{ pmatrix } 4 -3 \\ -1 \quad 1 \end{ pmatrix } src=https://huaweicloudobs.ahjxjy.cn/E1607D1CD801354D24E2E6076E48AE2F.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=\begin{ pmatrix } 1 -3 \\ -1 \quad 4 \end{ pmatrix } src=https://huaweicloudobs.ahjxjy.cn/4ED9AF9C1D102612A5C84CD9A3E7A340.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=\begin{ pmatrix } 4 1 \\ 3 1 \end{ pmatrix } src=https://huaweicloudobs.ahjxjy.cn/8829B02B6A32F5243AE80537423C0B48.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=\begin{ pmatrix } 4 -1 \\ -3 \quad 1 \end{ pmatrix } src=https://huaweicloudobs.ahjxjy.cn/75299D304F99AD87B08D190B96B5A286.png style=vertical-align: middle;/>