对装用转K4型转向架的车辆重车位时,KZW-4G型空重车自动调整装置的试验垫板厚度为

题型:单项选择题

问题:

对装用转K4型转向架的车辆重车位时,KZW-4G型空重车自动调整装置的试验垫板厚度为()。

A.23mm

B.30mm

C.3mm

D.36mm

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分层抽样适用的范围是(  )
A.总体中个数较少
B.总体中个数较多
C.总体中由差异明显的几部分组成
D.以上均可以
题型:单项选择题

One of the founding fathers of the internet has predicted the end of traditional television. Vint Serf, who helped to build the internet while working as a researcher in America, said that television was approaching its “iPod moment.”

In the same way that people now download their favorite music onto their iPods, he said that viewers would soon be downloading most of their favorite programmers onto their computers. “85 percent of all video we watch is pre-recorded, so you can set your system to download it at any time,”said Mr. Cerf, who is now the vice-president of Goggle.

“You’re still going to need live television for certain things--like news, sporting events and emergencies--but increasingly it will be almost like iPod, where you download content to look at later.”

Although television-on-demand has not yet become a main activity in the UK, the BBC, 1TV and Channel 4 have all invested a lot of money in technology which Mr. Cerf think will enable viewers to watch their favorite shows on their computers.

However, some critics(批评家)have warned that the Internet will collapse(崩溃)if millions of people try to download programmers at the same time.

Over the next four years, scientists think the number of videos watched over the Internet will double, with people moving from short chips to hour-long programmes.

Broadband companies claim that the service will cause“traffic jams”,which will cost millions of pounds to solve. Mr. Cerf dismissed these warnings, saying that critics had predicted 20 years ago that the net would collapse when people all around the world started to use it at the same time, “We’re far from exhausting (用尽)the capacity,” he said.“I want every one of the six billion people in the planet to be able to connect to the Internet.”

61.Vint Cerf is all the following EXCEPT that ___________.

A. a researcher in the United States

B. the vice-president of Goggle

C. one of the founders of the Internet

D. a manager of a broadband company

62. Which of the following is NOT something Vint Cerf has predicted?

A. Traditional television will soon have its iPod moment.

B. The number of videos watched over the Internet will double.

C. Viewers will be able to download TV programmers onto their iPods.

D. Viewers will be able to watch their favorite TV shows on the Internet.

63. According to the passage, people can always do all the following EXCEPT ____________.

A. watch short clips over the Internet

B. download live TV over the Internet

C. download per-recorded videos over the Internet

D. listen to their favorite music on their computers

64. Some critics are now predicting __________.

A. the Internet will collapse if millions of people use it at the same time

B. people all over the world will be able to connect to the Internet

C. the Internet will crash if  too many people download TV programmes at the same time

D. the videos people watch over the Internet

65. This passage mainly tells us __________.

A. a Goggle expert is predicting the end of traditional television

B. the Internet will never be used to download people's favourite shows

C. the Internet will become more popular

D. something about Vint Cerf

题型:单项选择题

健康成年人一次献血200~300mL时,他的身体状况是

A.恢复较快,不影响健康

B.生命活动短期内有困难

C.生命活动虽短期内有困难,但不久可以恢复

D.危及生命

题型:单项选择题

下列叙述不属于阿托品性质的是()。

A.可抑制腺体的分泌

B.可通过胎盘但不能透过血-脑脊液屏障

C.药用消旋莨菪碱

D.阻断M胆碱受体发挥作用

E.临床可以用于验光和检查眼底

题型:单项选择题

如右图表示土壤中甲、乙两种矿质元素浓度变化与植物生长速率的关系,据图分析回答:

通常在水淹条件下植物对矿质元素的吸收量减少。为什么?()

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