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(

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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.ios::in

B.ios::out

C.ios::in | ios::out

D.以上都不对

考点:计算机等级考试C++计算机二级(C++)15
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如图中的甲和乙是两种声音的波形图,从图形可知:图 _________ 是乐音的波形。

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由新生儿到成人,上颌骨的长度约增长 ()

A.2.5倍

B.1.5倍

C.100%

D.50%

E.25%

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关于二战时期的重要会议,下列说法不正确的是:()

A.“雅尔塔会议”作出了战后世界秩序安排

B.“开罗会议”确定了日本侵略罪行及战后对日本的处理问题

C.“德黑兰会议”美、英、苏三大盟国共同商量对日作战问题

D.“波茨坦会议”召开于德国无条件投降,欧洲战争结束之后

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阅读理解

     Research has shown that music has an important effect on one's body and psyche (心灵). In fact,

there is a growing field of health care known as music therapy, which uses music to treat diseases. Even

hospitals are beginning to use music therapy. This is not surprising, as music affects the body and mind in

many powerful ways.

     Research has shown that quick music can make a person feel more alert, while slow music can

produce a calm, deep thinking state. Also, research has found that music can change brainwave activity

levels. This can help the brain to change speeds more easily on its own as needed, which means that

music can bring lasting benefits to your state of mind, even after you've stopped listening.

     Breathing and heart rates can also be influenced by music. This can mean slower breathing, slower

heart rate. This is why music and music therapy can help reduce the damaging effects of long-term stress,

greatly promoting (促进) not only relaxation, but health.

     Music can also be used to bring about a more positive state of mind by helping to keep worries away. Music has also been found to bring many other benefits, such as lowering blood pressure and reducing

the risk of strokes. It is no surprise that so many people are considering music as an important tool to

help the body become or stay healthy.

1. What can we infer about music therapy?

A. It is a type of music.

B. It is a research about music.

C. It is akind of musical effect on diseases.

D. It is the use of music method to help treat diseases.

2. According to the second paragraph, we can know that ________.

A. music with different speeds has different effects

B. quick music is not good for one's health

C. slow music can help one to think more calmly and slowly

D. music will have less benefit after one stops listening

3. The reason why music can help deal with stress is that ________.

A. it is used by many hospitals

B. it can help change brainwaves

C. it does good to breathing and heart rates

D. it can bring a more positive state of mind

4. According to the passage, music can help deal with all the following EXCEPT ________.

A. nervousness          

B. mind illnesses

C. strokes          

D. high blood pressure

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闪点在()以下的是易燃品,在()以上的是可燃品。

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