A:①②③④
B:①②④③
C:②①④③
D:③①④②
—Yes, but I can't ________________ an expensive one.
将6g生铁样品加入到盛有100g过量硫酸的烧杯中(样品中杂质不溶于水,也不与稀硫酸反应),充分反应后,称得烧杯内剩余物质的总质量为105.8g,试行算: