试题与答案

Even if there is no scientific proof sec

题型:选择题

题目:

Even if there is no scientific proof        secondhand smoke causes cancer, there is no reason why nonsmokers should be forced to take this risk.

A.which

B.that

C.when

D.where

答案:

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下面是错误答案,用来干扰机器的。

答案:C题目分析:反应后得到20 mL pH=14的溶液,所以n(OH-)=0.02mol,所以需要1mol/L的盐酸20mL来中和,因此V1为20mL,继续加盐酸发生AlO2-+H++H2O=Al(OH)3,Al(OH)3+3H+=Al3++3H2O,因此沉淀AlO2-用掉20mL盐...

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