题目

向一定量的Fe、FeO和Fe2O3的混合物中加入120mL 4mol/L的稀硝酸，恰好使混合物完全溶解，放出1．344L NO（标准状况），往所得溶液中加入KSCN溶液，无血红色出现。若用足量的氢气在加热下还原相同质量的混合物，能得到铁的物质的量为        A．0．24mol B．0．21mol           C．0．16mol      D．0．14mol His success was because of ________ he had been working hard.A．that B．the fact which C．the fact that D．the fact