关于阑尾黏液囊肿的说法错误的是（） A.是由阑尾腔内大量积聚的黏液使阑尾扩张而成

对成年人胸外双相波电除颤最常用的电能是（）。

A.100J

B.200J

C.300J

D.400J

E.500J

男性，39岁。左腰背部撞击伤后剧烈腹痛伴恶心、呕吐2小时。查体：P120次／分，BP60/40mmHg。腹式呼吸减弱，全腹压痛、反跳痛、肌紧张明显，左肋膈角区叩击痛，肠鸣音弱。

在其临床特点中，下列不正确的是（）。

A.发病率占腹部损伤的40%～50%

B.真性破裂占85%

C.治疗原则是采取紧急手术处理

D.成人术后暴发型感染的发病率一般不超过1%

E.如果出现暴发型感染，大肠杆菌为主要病原菌

下列说法中，错误的是

A．元素周期表中有7个主族、7个副族

B．碳元素位于第二周期IVA族

C．稀有气体元素原子的最外层电子数均为8个

D．氢分子中的化学键是共价键

下列商品编码对应的检验检疫类别与其他三个不同的是：

A.0709591000

B.1504300010

C.2003901020

D.2005200000

Americans usually consider themselves a friendly people. Their friendships, however, tend to be shorter and more casual than friendships among people from other cultures. It is not uncommon for Americans to have only one close friend during their lifetime, and consider other "friends" to be just social acquaintances. This attitude probably has something to do with American mobility and the fact that Americans do not like to be dependent on other people. They tend to "compartmentalize" (划分) friendships, having "friends at work" , "friends on the softball team" , "family friends" , etc.

Because the United States is a highly active society, full of movement and change, people always seem to be on the go. In this highly charged atmosphere, Americans can sometimes seem brusque (无礼的) or impatient. They want to get to know you as quickly as possible and then move on to something else. Sometimes, early on, they will ask you questions that you may feel are very personal. No insult is intended; the questions usually grow out of their genuine interest or curiosity, and their impatience to get to the heart of the matter. And the same goes for you. If you do not understand certain American behavior or you want to know more about them, do not hesitate to ask them questions about themselves. Americans are usually eager to explain all about their country or anything "American" in which you may be interested. So much so in fact that you may become tired of listening. It doesn’t matter, because Americans tend to be uncomfortable with silence during a conversation. They would rather talk about the weather or the latest sports scores, for example, than deal with silence.

On the other hand, don’t expect Americans to be knowledgeable about international geography or world affairs, unless those subjects directly involve the United States. Because the United States is not surrounded by other nations, some Americans tend to ignore the rest of the world.

Which of the following statements is NOT true according to the passage().

A. Friendships among Americans tend to be casual.

B. Americans do not like to depend on other people.

C. Americans always seem to be on the go.

D. Americans know a lot about international affairs.