局二一轮复习·新咼考第二节One possible versionDear Sir/madamI' m writing to complain about a Kindle that I pur-chased from your website on May i stAfter one week of its purchase, I found it didnt workas expected. The battery didn't last long after beingrecharged, perhaps merely half a day. Worse than that, thewords on the screen were not distinct enough, which i thinkis damaging to my eyesighthave been a devoted customer of your company and: Ihope you will look into the matter seriously and replace thefaulty Kindle with a new one as guaranteed. Thank youYours sincerelyLi Hua

15.B【解析】K。(CdS)=c(Cd2+)·c(S2-),在饱和溶液中c(Ca2+)=c(S2),图中a和b分别为T1、T2温度下Cds的溶解度,A项正确;K甲(m)=K,(n)=K(p)

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