题干

胡萝卜素的提取中,萃取液的浓缩采用的装置是      

A:蒸馏装置

B:压榨装置

C:萃取装置

D:冷凝回流装置

上一题 下一题 0.0难度 选择题 更新时间:2016-09-26 05:54:28

答案(点此获取答案解析)

A

同类题3

根据短文理解,选择正确答案。The British Museum
What's on
    Although many parts of Asia have long been connected through trade along Silk Road and shared religious systems, there are strong regional differences. In addition to various languages, Asia has developed its cultural networks, patterns of government, technology and styles of artistic representation.
    The diverse cultural life of Africa has been expressed through everyday cooking objects and unique works of art since ancient times. The Museum's collection of over 200,000 African items includes archaeological and contemporary material from across the continent.
    The Iron Age was a time of big change for the people of Britain and Europe.Iron replaced bronze as the material used to make tools and weapons, while religion, art, daily life, economics and politics changed greatly.
Admission and opening times
    The Museum is free and open daily 10:00-17:30 except Friday, and is open until 20:30 on Fridays, except Good Friday. The Museum is open every day except for 24,25 and 26 December and 1 January.
Museum shops
Bookshop
Monday-Thursday 10:00-17:30 Friday 10:00-20:00
Saturday 10:30-17:30 Sunday 10:00-17:30
Collections shop
Monday-Thursday 09:30-17:30 Friday 09:30-20:00
Saturday 09:30-17:30 Sunday 10:00-17:30
Getting here
By Tube
Nearest underground stations:
Tottenham Court Road(500m) Holborn (500m)
Russell Square(800m) Goodge Street(800m)
By bus
Buses that stop near the Museum:1,8,19,X25,38,55,98,242
By car
    The Museum lies within the Congestion(拥堵) Charge Zone. There is little on-street parking nearby. The nearest car park to the Museum is located at Bloomsbury Square. There is limited parking in the Museum's open space for disabled visitors only.

同类题5

20世纪的战争与和平

材料:1953年入主白宫的美国总统艾森豪威尔,上台前猛烈攻击遏制战略,指责它使美国耗费了大量金钱,却不能取得应有的胜利。他上台后便立即着手制定美国的新战略。随后,艾森豪威尔批准了国家安全委员会第162号文件──“国家安全基本政策”,称为“新面貌”文件。文件认为苏联的威胁主要表现在其强大的军事力量、对西方自由世界的敌视及对亚非拉国家的渗透和颠覆上。“新面貌”战略坚持了艾森豪威尔的“大平衡”思想,提出“应付苏联对美国安全的威胁,在这样做的同时,避免严重削弱美国经济或损害我们的基本价值和制度”。在缩减军费的情况下,为最大限度地满足军方的要求,文件强调“以进攻性打击力量实施大规模报复性破坏的能力”,要在核武器的数、质量上都保持对苏联的优势.不过在苏联已拥有核武器的情况下,美国统治集团认识到了进行核威慑的局限性,因此强调在裁减常备军的同时,加强后备力量建设。文件承认美国的联盟政策面临着种种问题,最使美国担心的是“西欧越来越不愿追随美国的领导”。因此文件强调使盟国相信“美国的安全战略是集体安全战略.联盟必须扎根于对利益共同体的强烈信念,并坚信美国领导的稳定性和明智性”。另外,艾森豪威尔政府对心理战可谓情有独钟,它不仅设立了隶属于白宫的心理作战局,还把这种颠覆手段引为“新面貌”战略的重要组成部分。

──陈思、杜正艾《两霸争雄:美苏冷战及后冷战时代》