请你运用化学知识解释生活中的一些现象: (1)鹅卵石河底比泥河底的河流清澈得多,

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问题:

请你运用化学知识解释生活中的一些现象:

(1)鹅卵石河底比泥河底的河流清澈得多,原因是______;在某些农村常用明矾来净水,其作用是______.

(2)在冬季,人们常看到养鱼池的冰面上打有很多洞,其原因是______

(3)炸油条时,当面团放入油锅后,碳酸氢钠受热分解成碳酸钠、水和二氧化碳,不断产生的二氧化碳会使油条膨胀并浮出油面.该反应类型是______,请用化学方程式表示其中的变化______.

考点:水的净化化学反应方程式的书写文字表达式酸的用途碱的用途
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胸椎活动范围不正确的是()。

A.胸椎轴性旋转范围上小下大

B.矢状面上胸椎下段活动度为12°

C.矢状面上胸椎上段活动度为4°

D.冠状面上上胸段侧屈活动范围为6°

E.冠状面上胸段最下节段活动范围为9°

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A Japanese toy maker declares that they have developed a gadget that translates dog barks into human language and plans to begin selling the gadget——under the name of Bowlingual——in U. S. pet stores and gift shops this summer.

Tokyo-based Takara Co. Ltd. says about 300, 000 of the dog translator gadgets have been sold since it was on sale in Japan late last year. It is forecasting far bigger sales once an English language translation for dogs comes to America in August. The United States is home to about 67 million dogs, more than six times the number in Japan.

"We know that the Americans love their dogs so much, so we don't think they will mind spending $ 120 on this product, " the Takara marketing manager said during an interview at a recent pet products conference in Atlanta.

Regarded as one of the coolest inventions of 2002 by Time magazine, Bowlingual is made up of a 3 - inch long wireless microphone that is fastened to a dog collar and sends out sounds to a small console (控制台) that is connected to a database (数据库). The console divides each bark into six emotional types——happiness, sadness, disappointment, anger, threat and desire——and shows common phrases, such as "You're ticking me off," that fit the dog's emotional state.

Takara says it has spent millions of dollars developing the gadget in cooperation(合作)with famous sound experts and animal behaviorists.

One thing that does appear certain is that the markets for animal translation products will likely remain a dog's world since Takara has no plans to develop a similar gadget for cats. "They are too unpredictable (反复无常) , " the marketing manager said.

小题1:This passage mainly tells us that Bowlingual ___________.

A.was invented in Japan     

B.has developed quickly

C.will be sold in America

D.sells well for its price小题2:The underlined word "they" in the last paragraph refers to ___________.

A.markets

B.products

C.plans

D.cats小题3:From the passage, we can see that Takara Co. Ltd. is ___________ the sale of its new product.

A.proud of

B.satisfied with

C.confident of

D.worried about

题型:填空题

急救物品完好率在护理质量管理中属于()。

A.要素质量

B.环节质量

C.终末质量

D.过程质量

E.行为质量

题型:填空题

以下方法不能除去热原的是

A.吸附法
B.酸碱法
C.高温法
D.渗透法
E.反渗透法

题型:填空题

《中国药典》2005年版对甲苯咪唑中A晶型(低放晶型)的检查方法规定为()

A.紫外分光光度法

B.可见分光光度法

C.红外分光光度法

D.荧光分析法

E.吸收光谱法

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