【单选题】
欲使0.1mol/L的<img class="kfformula" src="20200629/1593414371655621.png" data-latex="{CH}_{3}COONa" width="110" height="34"/>溶液中,c(<img class="kfformula" src="20200629/1593414371705821.png" data-latex="{Na}^{+}" width="58" height="33"/>)/c(<img class="kfformula" src="20200629/1593414371315923.png" data-latex="{CH}_{3}{COO}^{-}" width="118" height="34"/>)更接近于1:1 ,应采取的措施是()。
③
加入适量<img class="kfformula" src="20200629/1593414371383535.png" data-latex="{CH}_{3}COOH" width="98" height="30"/>
【单选题】
二次函数<img class="kfformula" src="20190808/1565254258613538.png" data-latex="y={x}^{2}+mx+6"/>的顶点<img class="kfformula" src="20190808/1565254258861129.png" data-latex="\left ( {-1,5} \right )"/>,则<img class="kfformula" src="20190808/1565254258615064.png" data-latex="m"/>的值为( )
【单选题】
在等差数列<img class="kfformula" src="20190809/1565316326247415.png" data-latex="\left \{ {{a}_{n}} \right \} "/>中,<img class="kfformula" src="20190809/1565316326513469.png" data-latex="{a}_{1}=2"/>,<img class="kfformula" src="20190809/1565316326731066.png" data-latex="d=-2"/>,则前十项的和为( )
【判断题】
两个零多项式的最大公因式是<img width=16 height=19 src=https://main.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/temp/msohtmlclip1/01/clip_image002.gif style=background:url(https://main.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/>