题型:单项选择题 取苯巴比妥0.4045g,加入新制的碳酸钠试液16ml使溶解,加丙酮12ml与水90ml,用硝酸银滴定液(0.1025mol/L)滴定至终点,消耗硝酸银滴定液16.88ml,则苯巴比妥的百分含量(每ml的硝酸银滴定液0.1mol/L相当于23.22mg的苯巴比妥)A.98.4%B.96.8%C.96.9%D.99.3%E.99.9% 查看答案
题型:单项选择题 If a 10 percent income increase caused a group of consumers to increase their purchases of television sets from 95 to 105, the group's income elasticity of demand for television sets would be closest to:()A..1.00.B..0.10.C.0.83. 查看答案