题目

Tom has made great progress in his studies.       ,we are confident that he will pass the coming entrance examinations. A.Anyway         B.Therefore         C.Besides       D.Partly 答案:B4.下列关系中正确的是(  )A.将AgCl、AgBr饱和溶液等体积混合后,滴加足量的硝酸银溶液,其主要沉淀物为AgBrB.常温下,浓度为0.1mol•L-1的HA溶液(Ka=10-5)pH≈3C.c(SO32-)相等的Na2SO3溶液、NaHSO3溶液、H2SO3溶液的浓度:c(NaHSO3)>c(H2SO3)>c(Na2SO3)D.25℃时,向10mL0.01mol•L-1KOH溶液中滴加10mL0.01mol•L-1的醋酸溶液后,混合液中:c(K+)>c(CH3COO-)>c(OH-)=c(H+)
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