【单选题】【消耗次数：1】
关于龋齿的预防，错误的是( )
①
养成刷牙的好习惯
②
教会学前儿童正确的漱口方法
③
适当选择防龋食物
④
乳牙迟早要换掉，坏了没关系
参考答案：
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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
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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
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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】
一般来说，对什么部位牙齿的窝沟实行封闭，预防龋齿的效果最为理想：
①
刚萌出的后牙，尤其是新长出的第一恒磨牙
②
刚萌出的后牙，尤其是新长出的第二恒磨牙
③
刚萌出的后牙，尤其是新长出的第三恒磨牙
④
刚萌出的后牙，尤其是新长出的第四恒磨牙
随机题目
【多选题】
下列行列式等于9的是
①
<img class=jc-formula data-tex=\begin{ vmatrix } 3 0 \\ 0 3 \end{ vmatrix } src=https://huaweicloudobs.ahjxjy.cn/F15D8CAA4E4461C21CD787FD2A1ECD82.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=\begin{ vmatrix } 3 4 \\ 2 5 \end{ vmatrix } src=https://huaweicloudobs.ahjxjy.cn/AE9FF02AC649C351D9B5E6822F690B9E.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=\begin{ vmatrix } 9 3 \\ 1 2 \end{ vmatrix } src=https://huaweicloudobs.ahjxjy.cn/945CE2CB18F0E70A7FE7B01AF2A264FF.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=\begin{ vmatrix } 2 3 \\ 3 9 \end{ vmatrix } src=https://huaweicloudobs.ahjxjy.cn/4619DC5DD3C0F7BB1E1E58C3A84F53AF.png style=vertical-align: middle;/>
【单选题】
毛泽东在《关于正确处理人民内部矛盾的问题》一文中，指出社会主义社会的基本矛盾是？
①
无产阶级和资产阶级的矛盾
②
生产力与生产关系、经济基础与上层建筑的矛盾
③
人民内部矛盾与敌我矛盾
④
社会主义道路和资本主义道路的矛盾