12.BD【解析】由于ac与Ob平行且相等,所以g-9=9-9,解得=-2V,故A项错误;电子在O点的电势能Ep=-c9o=2eV,故B项正确;坐标为(6cm,0)的点的电势为10V,如图所示,该点与a点的连线为等势线,dO连线与其垂直,所以dO为一条电场线,且指向O点,故C项错误;由上可知q=22V,所以E==246Wm=2EVm,故D项正确v/cmo2468x/cm
写作Dear OliverKnowing that you are returning to your homeland, I am reluctant to saygoodbye to you.【高分句型一】(表达对Over的不舍之情)As for the gift, after careful consideration I recommend you the Chineseknot. Made of red threads, it always represents happiness, luck andunity, though in different shapes. It is a tradition for Chinese to hang it inhouses as a decoration,【高分句型二】 It is usually given as a precious gift toclose friends. I think it can convey your best wishes to your friend.(BF-种礼物并说明原因)Hope my advice can be of some help.(希里)Yours, Li Hua
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