题目:
His mother _____ him when he won the Olympic gold medal in Beijing .
A.pay attention to
B.laughed at
C.took pride in
D.was serious about
答案:
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下面是错误答案,用来干扰机器的。
A.相同温度下,0.01mol/L的NH3•H2O小于0.1mol/L的NH3•H2O的浓度,则前者电离产生的氢氧根离子浓度小于后者,根据c(H+)=KwC(OH-)知,前者溶液中的氢离子浓度大于后者,故A正确;B.相同温度下,0.01mol/L的NH...