温度相同、浓度均为0.2mol/L的①硫酸铵,②硝酸钠,③硫酸氢铵,④硝酸铵,⑤

题型:选择题

问题:

温度相同、浓度均为0.2mol/L的①硫酸铵,②硝酸钠,③硫酸氢铵,④硝酸铵,⑤碳酸钠,⑥醋酸钠溶液,它们的pH由小到大的排列顺序是(  )

A.①③⑥④②⑤

B.③①④②⑥⑤

C.③②①⑥②⑤

D.⑤⑥②④①③

考点:盐类水解判断溶液酸碱性或比较溶液pH值的大小
题型:选择题


Every Object Tells a Story凡事皆有戏
Everyone has a particular object to which they attach a special meaning or story. Every Object Tells A (1) is a participative website that enables people to explore the stories and meanings behind collections of museum objects. (2) to the site can create their own stories and share their own interpretations and objects online.
The project (3) on the art of storytelling and involves four regional museums, in partnership with Channel 4 and Ultralab, a (4) technology research centre at Anglia Polytechnic University. It will be led by the Victoria and Albert Museum. It (5) the personal meanings and histories behind objects to get people to look at them in new ways. It (6) designed to inspire them to create their own stories and share their interpretations and objects of personal significance (7) a growing online community.
Video, audio, text and pictures combine on the site to offer an enticing, accessible (8) into the content. Users can choose to browse the hundreds of objects featured, or they can search for (9) particular theme or person. They can decide on the level of information they want on an object, from (10) stories conveyed through text and pictures, to the richer experience offered by accompanying video and audio. They will (11) encouraged to add their own interpretation or object to the collection, by uploading text, images, video or audio (12) the site or by sending text and images from a mobile phone. In so doing, they will be (13) to the website’s content and illustrating how a single object can convey different meanings to different people.
The (14) stories and wonderful objects will appeal to a broad audience. The project has specific relevance to all key (15) of the National Curriculum in English and literacy. Outreach sessions in regional partner museums will encourage people to (16) involved in the project locally and a video booth will travel around England, visiting shopping centres, libraries, bus (17) and the like, to enable people to capture their object and story in a short video. This will (18) be uploaded onto the site.
In addition to the national and local publicity given to the project, Channel 4 (19) promote the website from a number of its programmes, ensuring a wide appeal and providing an added (20) for people to contribute their content.

题型:选择题
若分式
x-3
x+4
的值为0,则x的值是(  )
A.x=3B.x=0C.x=-3D.x=-4
题型:选择题
根据分子动理论,物质分子间距离为r0时分子所受到的引力与斥力相等,以下关于分子势能的说法正确的是(  )

A.当分子间距离是r0时,分子具有最大势能,距离增大或减小时势能都变小

B.当分子间距离是r0时,分子具有最小势能,距离增大或减小时势能都变大

C.分子间距离越大,分子势能越大,分子距离越小,分子势能越小

D.分子间距离越大,分子势能越小,分子距离越小,分子势能越大

题型:选择题

自动舵的正确操作步骤是:()

①、将选择开关从“随动”转至“自动”位置;

②、把船操稳在指定的航向上,并处于正舵位置;

③、根据情况调整有关功能旋钮;

④、接通电网电源,并选择机组及操舵系统;

⑤、将压舵及自动改向调节旋钮置于零位

A.①、②、③、④、⑤

B.⑤、④、③、②、①

C.④、②、⑤、①、③

D.④、②、⑤、③、①

题型:选择题

国际公认的细菌保藏权威机构是()

A.美国典型培养物保藏中心(ATCC.和德国微生物及细胞保藏中心(DSM)

B.中国微生物及细胞保藏中心

C.日本微生物及细胞保藏中心

D.英国皇家微生物及细胞保藏中心

E.俄国微生物及细胞保藏中心

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