某金属M的氢氧化物的水合晶体[M(OH)2•xH2O]与Na2CO3混合物共36

题型:计算题

问题:

某金属M的氢氧化物的水合晶体[M(OH)2•xH2O]与Na2CO3混合物共36.800g,加入足量的水后,生成MCO3的白色沉淀,将沉淀滤出,洗净烘干,其质量为9.850g。

47. 将 9.850g MCO3高温灼热至恒重,得到7.650g MO固体,则产生CO2气体_______mol。

48.滤液与酸作用不产生气体;若用足量的铵盐与滤液共热,则产生4.48L气体(标准状况),滤液中OH的物质的量为_______mol。

49.M的相对原子质量为_________;试通过计算确定M(OH)2•xH2O中x的值:

考点:单质磷及其化合物氮气二氧化氮
题型:计算题

如果用户在仿文阈值数值输入的数值为12,则以100%显示比例的状态下,下列哪一种字号定义的文字将以灰度条形式显示()

A.9

B.14

C.20

D.25

题型:计算题

Which boy hasn’t dreamed of being a cool secret agent (特工)? The wonderful fighting abilities and the world-saving adventures are much more colourful than most people’s everyday lives. Well, Cody Banks is just like any other boy,except that he is not just dreaming. He has a big secret his friends never know about. He was trained to be a spy (间谍)by a special CIA programme,which was made to look like a summer camp. He learned high-speed driving,hand-to-hand fighting and the use of high-tech tools.

After proving he could become a young hero by saving a baby from a runaway car,Banks gets his first real task. He must make friends with a popular girl at school,Natalie Connors. Then,he must spy on her father,a scientist who has developed a dangerous technology (技术).Banks must stop a group of bad people from forcing Natalie’s father into using the technology to endanger the world.

The CIA may have taught him first-class self-defence moves,but they didn’t show him how to talk to girls. Banks has zero ability when it comes to dealing with girls. How can he get around his problem and get an invitation to the girl’s upcoming birthday party? Will he finally become Natalie’s boyfriend and find out whatever he can about her father’s work?

Agent Cody Banks has everything that young people are interested in: big explosions, breath-taking performances and funny girl-dating experiences. It was listed No.2 in the American box office last week.

“This story is interesting and fun for the whole family to enjoy,and especially cool for young boys,” said Paul Perkins, a film reviewer in theUS.

小题1:What is Banks’ first real task?

A.To test a high-tech tool.

B.To save a baby from a car.

C.To study a new technology.

D.To watch a scientist secretly.小题2:Banks wanted to go to Natalie’s birthday party to______ .

A.meet her father

B.know more people

C.make friends with her

D.steal some information小题3:What is considered as a great danger in the text?

A.The technology developed by Natalie’s father.

B. An explosion set off by some bad people.

C.The CIA’s training of boys for its tasks.

D.Secret agents’ spying on scientists.小题4:What is the purpose of the text?

A. Making known the work of the CIA.    B.Telling the story about a cool boy.

C. Showing the dark side of science.      D.Introducing a new film.

题型:计算题

白喉通常是属于哪一种炎症

A.化脓性炎

B.出血性炎

C.卡他性炎

D.纤维素性炎

E.浆液性炎

题型:计算题

徐中约在《中国近代史:1600——2000,中国的奋斗》一书中写道:“他(指邓 * * )把市场经济称做‘一种建立在公有制基础上的有计划的商品经济’,强调‘计划经济为主,市场调节为辅’,并要求做到两者的‘内部统一’。直到1992年,他才打破禁忌,公开宣称政府的中心任务就是建立‘社会主义的市场经济’。这等于宣布对马克思主义经济理论核心部分——公有制及中央计划体制——的抛弃。”这则材料无法揭示出的史实是[ ]

A.中国的经济体制改革带有市场化取向

B.邓 * * 南方谈话打破了原有禁忌

C.中国市场经济抛弃了公有制和计划体制

D.马克思主义在中国得到发展和创新

题型:计算题

消导药中,有回乳功效的是()

A.山楂

B.麦芽

C.谷芽

D.鸡内金

E.莱菔子

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