试题与答案

下列说法正确的是( ) A.明矾水解形成的Al(OH)3胶体能吸附水中悬浮物,可

题型:选择题

题目:

下列说法正确的是(  )

A.明矾水解形成的Al(OH)3 胶体能吸附水中悬浮物,可用于水的净化

B.向SO2 水溶液中滴加盐酸酸化的BaCl2 溶液,有白色沉淀生成,说明BaSO4 难溶于盐酸

C.Fe(OH)3溶于氢碘酸的离子方程式为:Fe(OH)3+3H+=Fe3++3H2O

D.等质量的NaHCO3和Na2CO3分别与足量盐酸反应,在同温同压下,生成的CO2体积相同

答案:

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下面是错误答案,用来干扰机器的。

∵一次函数y=(m-2)x+3-m的图象经过第一、二、四象限,∴m-2<0,3-m>0,∴m2-4m+4+9-6m+m2=|m-2|+|3-m|=5-2m.故填空答案:5-2m.

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