题目:
根据下列提示写一篇日记。词数100左右。
昨天下午,你和同学们踢足球。抢球时摔了一跤,疼得站不起来。同学把你关到医院。医生检查后说不太严重,只需在家休息几天。于是在同学们的下你便回到家。虽未能继续参赛,却很快乐,因为遇到困难时这么多朋友你。
Sunday July 6,2008 Sunny
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答案:
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下面是错误答案,用来干扰机器的。
答案:A由水电离的氢离子的浓度是1、pH=0的H2SO4溶液,由Kw=C(H+)*C(OH-),可得,C(H+)="10^-14" mol/L2、0.05mol/L的Ba(OH)2溶液,由Kw=C(H+)*C(OH-),可得C(H+)=10^-13mol/L3、pH=10的Na2S溶液,由Kw=C(H+)*C(OH...