物理层接口的4个特性( )。A.机械特性、电气特性、物理特性、工程特性 B.机械特

题型:单项选择题

问题:

物理层接口的4个特性( )。

A.机械特性、电气特性、物理特性、工程特性

B.机械特性、电气特性、功能特性、过程特性

C.物理特性、工程特性、功能特性、过程特性

D.电气特性、物理特性、机械特性、工程特性

考点:计算机等级考试网络技术三级网络技术笔试13
题型:单项选择题

桃果实成熟后,如果软化快,耐贮运性就会差。下图表示常温下A、B两个品种桃果实成熟后硬度等变化的试验结果。

据图回答:

(1)该实验结果显示桃果实成熟后硬度降低,其硬度降低与细胞壁中的_________降解由关,该物质的降解与_______的活性变化有关:也与细胞壁中的降解有关,该物质的降解与________的活性变化有关。

(2)A、B品种中耐贮运的品种是________。

(3)依据该实验结果推测,桃果实采摘后减缓变软的保存办法应该是________,因为____________。

(4)一般来说,果实成熟过程中还伴随着绿色变浅,其原因是__________________。

题型:单项选择题

在骨折的急救中,对有骨折的重症伤员,首要应处理

A.瘫痪

B.疼痛

C.出血

D.骨折

E.内脏损伤(危及生命的)

题型:单项选择题

If cars had wings, they could fly and that just might happen, beginning in 2012.The company Terrafugia, based in Woburn, Massachusetts, says it plans to deliver its carplane, the Transition, to customers by the end of 2012.

“ It's the next ’wow’ vehicle,” said Terrafugia vice president Richard Gersh.“Anybody can buy a Ferrari, but as we say, Ferraris don't fly.”

The car plane has wings that unfold for flying-a process the company says takes one minute-and fold back up for driving. A runway is still required to take off and land.

The Transition is being marketed more as a plane that drives than a car that flies, although it is  both.The company has been working with FAA to meet aircraft regulations, and with the National High way Traffic Safety Administration to meet vehicle safety regulations.

The company is aiming to sell the Transition to private pilots as a more convenient and cheaper way to fly.They say it saves you the trouble of trying to find another mode of transportation to get to and from airports: You drive the car to the airport and then you're good to go.When you land, you fold up the wings and hit the road.There are no expensive parking fees because you don't have to store it at an air port-you park it in the garage at home.

The carplane is designed to fly primarily under 10,000 feet.It has a maximum takeoff weight of 1,430 pounds, including fuel and passengers.Terrafugia says the Transition reduces the potential for an accident by allowing pilots to drive under bad weather instead of flying into marginal(临界) conditions.

The Transition's price tag: $ 194,000.But there may be additional charges for options like a radio, transponder or GPS.Another option is a fullplane parachute.

“If you get into a very awful situation, it is the necessary safety option,”Gersh said.

So far, the company has more than 70 0rders with deposits. “We're working very closely with them,

but there are still some remaining steps, ” Brown said.

小题1:We can learn from the first paragraph that         

A.carplanes will be popular in 2012

B.people might drive a carplane in 2012

C.both Transition and Ferrari can take off and land

D.Richard Cersh is the vice president of Massachusetts小题2:It takes the carplane one minute to          

A.fold and- unfold its wings

B.unfold wings for flying

C.land in the airport

D.meet flying safety regulations小题3:According to the passage,  which of the following is NOT true?

A.The carplane needs a runway to take off and land.

B.To meet aircraft regulations, the company has been working with FAA.

C.The carplane may fly as high as normal planes.

D.People can park the carplane in the garage at their home.

小题4:The underlined word "it" in the last but one paragraph refers to          

A.the radio

B.the transponder

C.the GPS

D.the fullplane parachute小题5:What's the best title for the passage?

A.Cars With Wings May Be Just Around The Comer

B.Which To Choose: A Ferrari Or A CarPlane?

C.A More Convenient And Cheaper Way To Fly

D.Cars With Wings Can Fly As Fast As Plane

题型:单项选择题

如果要将菜单文件添加到顶层表单中,必须在 【11】 对话框中勾选“顶层表单”复选框。

题型:单项选择题

非居民企业在中国境内设立了机构、场所但取得的所得与其所设机构、场所没有实际联系的所得,以机构、场所所在地为企业所得税纳税地点。

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