离心式水泵怎样平衡轴向力？

Choose the best answer. (根据短文内容，选择最恰当的答案，用A，B，C或D表示。)

    "I spend more time in chat rooms than with my 'real-life' friends." Do you know any people like these?

They are part of a new addiction (瘾) called Internet addiction. Internet addicts spend at least thirty to

forty hours online every week. The use of the Internet can be an addiction like drug (毒品) use. People

lose control (控制) of the time they spend on the Internet. 

    For example, one college student was missing for several days. His friends were worried, and they

called the police. The police found the student in the computer lab. He was surfing the net for several days

straight. 

    Studies show that about 6 to 10% of Internet users become addicted. And people worry about the teens

because the Internet is changing the playing field for some of them. They spend more time in cyberspace

than in the real world of friends and family. 

    Is "surfing the net" a hobby or an addiction for you? You may have a problem if you have these

symptoms (症状):

   ·You do not go to important family activities or you do not school work because you like to spend hours

on the Internet. 

   ·You can't wait for your next online time. 

   ·You plan to spend a short time online, but then you spend several hours. 

   ·You go out with your friends less and less.

1. What does the beginning of the passage tell us? [ ]

A．How to become an Internet addict.

B．What an Internet addict usually does.

C．Where to find an Internet addict.

D．Why to write this passage.

2. How does the writer describe the addicts' use of Internet? [ ]

A．It is something like keeping drugs.

B．It is a way of producing drugs.

C．It is like taking drugs.

D．It is terrible to imagine.

3. Why do people worry about the teens? [ ]

A．The teens are wasting too much money.

B．They used to work on the Internet.

C．The playing field of the teens will disappear.

D．More and more of the teens will become addicted to the Internet.

4. The example in the passage shows that ______.[ ]

A．Internet problems are more serious among college students

B．Internet addicts usually stay in the computer lab without sleep

C．Some of the Internet users have already been seriously addicted

D．The police often help to find those Internet addicts

5. Which of the following is not a symptom of the internet addiction? [ ]

A．You do not want to go outside with your friends a lot.

B．You feel uncomfortable without the online time.

C．You like doing your homework very much.

D．The time flies when you are online.

6. What is the writer trying to tell us at the end of the passage? [ ]

A．Don't be addicted to the Internet.

B．Go to family activities more often.

C．Do things as you have planned.

D．Stay with your parents as often as possible.

下列各项属于改善直间工比率的措施有（）。

A.有效地利用省人化物流机械设备

B.减少仓库从业人员

C.重新设计程序

D.更好地利用现有资源

E.致力改进问题突出的工作环节

存在（）情形的证券公司不具有申请基金代销业务的资格。

A．最近2年没有挪用客户资产等损害客户利益的行为

B．净资本等财务风险监控指标符合中国证监会要求

C．最近3年内因违法违规行为受到行政处罚

D．没有发生诉讼、仲裁等其他重大事项

大脑中动脉起自（）

A.颈内动脉

B.颈外动脉

C.基底动脉

D.椎动脉

关于交易后直通式处理表述正确的是（）

A、是指实现交易系统、清算系统和结算系统的无缝连接，交易从达成到最后的结算完全实现电子化处理

B、交易系统的成交数据可自动传输到后台形成结算数据，进入结算程序

C、直通式处理在降低操作风险的同时，大大提高了金融市场的交易效率

D、本币交易系统提供数据接口，可与市场成员的内部管理、清算等系统连接