当使用fstream流类定义一个流对象并打开一个磁盘文件时,文件的隐含打开方式为(

题型:单项选择题

问题:

当使用fstream流类定义一个流对象并打开一个磁盘文件时,文件的隐含打开方式为( )。

A.类

B.预处理命令

C.主函数

D.语句

考点:计算机等级考试C++计算机二级(C++)13
题型:单项选择题

下列物质互为同分异构体的一组是(  )                              

A.35 Cl和37 Cl

B.正丁烷和异丁烷

C.O2 和 O3

D.H2O 和 H2O2

题型:单项选择题

阅读理解。

     Like many other small boys, I was fascinated by cars, not least because my oldest brother

was a bit of a car guy and subscribed to cool magazines like Car and Driver and Motor Trend.

Every so often, one of those magazines would run an article on the "Car of the Future". They

featured unconventional styling and things like small nuclear reactors as power sources. Yet,

frankly, my car doesn't do anything that my brother's Studebaker didn't do. It goes, it stops, it

burns gasoline, it plays music. I still have to steer it, and it still runs into things if I don't steer it

carefully.

     But guess what? All of these things are subject to change in the not-so-distant future. It will

still go and stop, but it may not burn gasoline, I may not have to steer it, and it may be a lot better

at not running into things.

     Airbags aren't the be-all and end-all in safety. In fact, considering the recent news about people

occasionally being killed by their airbags in low-speed collisions (碰撞),they obviously still need

some development. But they aren't going away, and in fact, you can expect to see cars appearing

with additional, side-impact airbags, something some European car manufacturers already offer.

     Better than systems to minimize (使减少到最低限度) injury in the event of an accident,

however, are systems that minimize the likelihood of an accident happening in the first place. Future

cars may be able to eliminate many of the major causes of accidents, including drunk-driving,

tailgating (与前车距离过近) and sleepiness. Cars could be equipped with sensors that can detect

alcohol in a driver's system and prevent the car from being started, for example. Many accidents

are caused by people following the car in front too closely. As early as next year, you'll be able to

buy cars with radar-equipped control systems. If the radar determines you're closing too quickly

with the car in front, it will ease up on the throttle (油门). For city streets, expect other radar devices

that will give advance warning that the car in front of you has slowed abruptly (突然地) and you

should step on the brakes-or that may even brake for you.

     Will cars eventually be able to drive themselves? There's no reason to think it won't be technically

possible, and Mercedes is working on a system that can brake, accelerate and steer a vehicle down

a highway on its own. Nobody really expects people to give up all control to their cars, but such

systems could be used as failsafe systems to keep cars on the road and bring them safely to a stop

even if the driver suddenly became disabled.

1. Why was the author fascinated by cars?

A. Because other small boys liked to own a car of their own, too.

B. Because he read exotic things about cars in his brother's magazines.

C. Because his oldest brother loved to take him to places in his car.

D. Because he subscribed to cool car magazines.

2. By saying "my car doesn't do anything that my brother's Studebaker didn't do", the author

means that_____.

A. my car is far better than my brother's

B. my car is not as good as my brother's

C. not much has changed in the performance of cars so far

D. much improvement has been made in the design of cars recently

3. Which of the following statements is true of airbags?

A. They are in need of further improvement.

B. They are going to disappear gradually.

C. They kill people instead of protecting them in low-speed collisions.

D. They are a standard feature of European cars.

4. According to the author, what will future cars do if the sensors detect alcohol in the driver's

system?

A. They will give a warning in advance.

B. They will brake automatically.

C. They will ease up on the throttle.

D. They will not start.

5. Which of the following statements is true according to the last paragraph?

A. People will give up all control to their cars.

B. Cars will be able to drive themselves.

C. No cars will ever break down on the roads.

D. Cars will all be equipped with failsafe systems.

题型:单项选择题

对于汉字的基本结构,以下描述正确的选项有()

A.汉字排列有横排、竖排两种

B.汉字排列有左排、右排两种

C.左重右轻是字体设计的基本法则

D.上紧下松是字体设计的基本法则

E.汉字为了达到空间分布的均匀,通常横细竖粗

题型:单项选择题

()具有服务及接待标准要求很高,重视礼仪,店外活动比较多等特点。

A.旅游观光团

B.政府代表团

C.文艺团队

D.会议团队

题型:单项选择题

心力衰竭时的病理生理变化是

A.心脏的后负荷减轻

B.心脏的前负荷减轻

C.心脏的后负荷增加

D.心脏的前负荷增加

E.心脏的前、后负荷均增加

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