由来自3个胚层的各种类型的组织混杂在一起构成的肿瘤称为A．腺癌 B．癌肉瘤 C．混合

在一定条件下，NO跟NH₃可以发生反应生成N₂和H₂O。现有NO和NH₃的混合物1mol，充分反应后所得产物中，若经还原得到的N₂比经氧化得到的N₂多1.4g。

（1）写出反应的化学方程式并用双线桥标出电子转移方向和数目。

（2）若以上反应进行完全，试计算原反应混合物中NO与NH₃的物质的量各是多少？

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

English, you are so popular

English is the world language, the language of international communication in many areas of life; trade, air and sea transport, tourism and sport. New ideas in science, technology and medicine happen so quickly that it is impossible and very expensive to translate everything into different languages. 小题1:   If you want to study some subject, you need to know professional words and phrases.

English is used as a first language in countries such as Australia, Canada， Ireland, New Zealand, the USA and many of the countries in the Caribbean. 小题2:  It is a way in which people who have different languages communicate with each other. This is especially true in many parts of Africa and India.

  小题3:  Australian, American or Irish English has another pronunciation or stresses, so sometimes you cannot understand, although you can speak English. The USA has no official national language. English is used like a natural language by all Americans, because it is very simple. The American variety is popular between no-native speakers, too.

English is far more worldwide in its distribution(分布) than all other spoken languages. 25% to 33% of the people in the world understand and speak English to some degree. And most of them can use English freely. 小题4: 

In 2001, the 189 member countries in the United Nations were asked what language they wished to use for communication with other countries. More than120 chose English, 40 selected French, and 20 wanted to use Spanish. 小题5:  However, the percentage of Internet users who are not native English speakers is increasing rapidly, especially in Asia.

A．It has become the most useful language.

B．Therefore, most things are published in English.

C．In other countries it is used as a second language.

D．However, English in all these countries is not the same.E.English is also the language particularly on the Internet.

F.There are at least 165 languages spoken in the United States.

G.Therefore, it is not surprising that all languages change through time.

甲试管中盛有0．5mol/L Na₂CO₃溶液10mL，慢慢往试管中加入1mol/L的盐酸7．0mL；乙试管中盛有1mol/L的盐酸7．0mL，慢慢往试管中滴加0．5mol/L Na₂CO₃溶液10mL，那么甲、乙两试管中产生的CO₂物质的量大小关系为

A．甲=乙

B．甲>乙

C．甲<乙

D．无法确定

36岁已婚妇女，闭经8个月。查子宫稍小。肌注黄体酮20mg连用3日，未见撤药性流血，再给予己烯雌酚1mg连服20日，后3天加用甲羟孕酮 10mg，出现撤药性流血。本例应诊断为

A．子宫性闭经
B．第一度闭经
C．第二度闭经
D．垂体性闭经
E．下丘脑性闭经

M8的4T法兰螺栓，其装配扭矩是（）。