简述平巷运输事故原因分析及预防措施。

根据票据法律制度的规定,下列有关票据上签章效力的表述中,正确的有()

A.出票人在票据上签章不符合规定的,票据无效

B.承兑人在票据上签章不符合规定的,其签章无效,但不影响其他符合规定签章的效力

C.保证人在票据上签章不符合规定的,其签章无效,但不影响其他符合规定签章的效力

D.背书人在票据上签章不符合规定的,其签章无效,但不影响其前手符合规定签章的效力

世界卫生组织定义的“活产”是指：妊娠的产物完全从母体排出时，具有（）。

A.呼吸、心跳、脐带动脉搏动、明确的随意肌运动四种生命现象之一

B.呼吸、会哭、脐带动脉搏动、明确的随意肌运动四种生命现象之一

C.呼吸、心跳、会动、明确的随意肌运动四种生命现象之一

D.呼吸、心跳、脐带动脉搏动、嘴唇红色四种生命现象之一

E.以上都不对

阅读理解。

     More than two-thirds of adults support the shutdown of social networks during periods of social

unrest such as the riots (暴乱) in England this summer, new research has shown.

     A survey of 973 adults carried out for the online security firm Unisys found 70% of adults supported

the shutdown of Twitter, Facebook and BlackBerry Messenger (BBM), while only 27% disagreed.

     Three-quarters agreed that governments should have open access to data on social network users in

order to prevent relevant (相应的) crime. Support for action against social networks was strongest

among over-65s and weakest among 18 to 24-year-olds, who are the heaviest users of the online

services.

     Several people were accused of attempting to start disturbances (骚动) using Facebook during the

outbreak of rioting across England in August. The court recently refused a request o lower the sentences

of two people sent to prison for four years for attempting to arrange riots on the social media site, despite

them not leading to any disturbances.

     Analysis by the Guardian found little evidence to support claims the network had been used to set

off unrest. However, the BBM network was believed to have played a role in organizing disturbances.

     It's very worrying that people would believe shutting down social networks would be worth. The vast

majority of social network use during the unrest was people spreading information and helping each other

get home safely. These kinds of actions would weaken the UK's position against authoritarian regimes (独裁 * * ). As we live more of our lives online, people should be conscious of the amount of power they're probably handing over to government.

     Jonathan Polanyi, a lawyer in criminal law and member of the Bar Council's IT Committee, said

developments across 2011 suggested the UK's legal system was failing to keep pace with technological

change.

     "We've seen discussions about libel (诽谤) and super-forbidden on Twitter; the use of social

networking to coordinate civil unrest in UK cities and a series of high profile attacks on well-known

companies which have led to loss of data," he said. "It is important that the law quickly develops to deal

with issues related to new technology."

1. Which of the following person probably most agree with against social networks?

A. A girl aged 10.          

B. An 18-year-old boy.

C. A young woman of 24.    

D. An old man of 66.  

2. Two people were sentenced to prison for four years because they             .

A. were against the social networks    

B. attempted to plan riots on the social media site

C. led to some disturbance to the social media site

D. started disturbances using Facebook and Twitter

3. What is analyzed by the Guardian proved that                .

A. the network had nothing to do with unrest    

B. the BBM network organized disturbances

C. shutting down social networks would be desirable

D. 70% of adults supported the shutdown of the network

4. What can be inferred from the last two paragraphs?

A. The UK's legal system should be changed completely.

B. The law associated with new technology should be progressed.

C. Twitter has led to loss of data and should be accused.

D. Some well-known companies were attacked by Twitter.

指数化投资策略是（）的代表。

A．战术性投资策略

B．战略性投资策略

C．被动型投资策略

D．主动型投资策略

由于热网管道的“最高点”或“最低点”少量异相介质的（）作用而产生的水击是最常见的。

A、阻滞

B、汽蚀

C、沸腾

D、振动