如图,在平面直角坐标系中,抛物线经过两点,, ,。过点作轴,交抛物线于点,交轴于点。 (1)求此抛物线对应的函数表达式及点的坐标; (2)若
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下列说法错误的是 A.25℃时,pH=9的NaHA溶液中: c(A)< c(H2A)B.25℃时,pH=9的NaHA溶液
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