C:B点对应的消耗铁粉的质量为8.4 g
A:OA段产生的气体是NO,BC段产生的气体是H2
B:A点对应消耗NO3-物质的量为0.1 mol
D:原混合酸溶液中H2SO4浓度为2.0 mol·L-1
Because Sarah has always saved __________, she is now able to afford a big house.