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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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...