不知足且厌恶风险的投资者的偏好无差异曲线具有的特征是（） A.无差异曲线向左上方倾斜

根据我国船舶安检规则，实施检查的海事管理机构可以请求其他海事管理机构到港船舶存在缺陷的纠正情况进行()。

A.跟踪检查 

B.详细检查 

C.委托检查 

D.特别检查

《廉政准则》第一条第一项所称“以借为名占用”，具体指的是什么？

下列选项中，对框筒结构剪力滞后效应理解正确的是（）。

A.翼缘框架柱中，中部柱的轴力小于平均值

B.腹板框架各柱的轴力呈线性分布

C.提高窗裙梁的刚度可减小剪力滞后现象

D.水平力作用下，框筒结构的侧移曲线以弯曲型为主

吸收塔建立液位，用氮气充压前，要先投用（）

A、吸收塔安全阀

B、再生塔安全阀

C、溶液过滤器

D、吸收塔、再生塔安全阀

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.

The phrase 6ihighly charged" (Para. 2) most probably means ().

A. highly responsible

B. extremely free

C. full of mobility and change

D. very cheerful