题目

Female Chinese space pioneers? CHINA plans to recruit(招募) women astronauts thanks to the lobbying(游说) of the leading women’s organization. Gu Xiulian, president of the All-China Women’s Federation(ACWF) (全国妇联), said on Saturday that she put forward a proposal that women be trained for space missions after the manned space flight last October. And it was accepted by the central authorities, local media reported. But the plan to recruit female astronauts has yet to be worked out, according to sources close to the astronaut-training programme. Beijing needs mental health care 一定量Fe和Fe2O3的混合物投入250 mL 2 mol·L-1硝酸溶液中，反应完成后，生成1.12 L NO（标准状况下），再向反应后的溶液中加入1 mol·L-1 NaOH溶液，要使铁元素完全沉淀下来，所加入的NaOH溶液体积最少是（    ） A.450 mL              B.500 mL              C.400 mL             D.不能确定