若有如下二叉树,则对此二叉树前序遍历的结果为( )。 A.XZCYAB B.X

题型:单项选择题

问题:

若有如下二叉树,则对此二叉树前序遍历的结果为( )。

A.XZCYAB

B.XYZABC

C.XYABCZ

D.XYAZBC

考点:计算机等级考试ACCESS二级ACCESS笔试371
题型:单项选择题

阅读理解。

     John sent his mother expensive presents on his mother's birthday every year. He liked to show her how

rich he was.

     "I must find something wonderful for her, and it must be the only one in the whole world." John thought.

     He advertised (登广告) in the newspapers." Wanted-the best present for the woman who has everything."

     For many days his telephone did not stop ringing. People phoned him from all over the world. They wanted

to sell him"the best present". But they did not have anything that was the only one in the whole world.

     Then less than a week before his mother's birthday, a man came to his office. He was carrying a cage, and

in the cage there was a large bird.

      "This bird," the man said, "can speak ten languages and sing any pop song. There is no other bird like it in

the world."

      "I will listen to it," John said. "If what you said is true, I will buy the bird from you." The man spoke to the

bird. "Talk to me in French," he said. The bird spoke to him in French. "Tell me a joke in Japanese," he said.

The bird told him a joke in Japanese."Sing a famous pop song," he said. The bird sang a famous pop song.

      "I'll buy it,"John said. "How much do you want?"

      "One hundred thousand dollars," the man said. This was a lot of money but John paid him. Then he sent

the bird to his mother with a birthday card.

      The day after his mother's birthday he phoned her. "Well, mother," he said, "Is the bird wonderful?"

      "Oh, it was delicious, dear," she said.

1. Why did John send her mother expensive presents for her birthday every year?

A. Because he loved his mother very much.

B. Because his mother needed these presents.

C. Because he wanted to show he had a lot of money.

D. Because he was the richest man in the world.

2. How did people know John wanted the best present in the world? 

A. They rang John up.

B. They knew it from the newspapers.

C. John phoned them one by one.

D. They knew it on TV.

3. When did the man with a bird come to visit John?

A. Two weeks before John's mother's birthday.

B. On John's mother's birthday.

C. About five days before John's mother's birthday.

D. Less than a week after John's mother's birthday.

4. Why did John pay the man a lot of money for the bird?

A. Because it was such a beautiful bird.

B. Because he wanted to help the poor man with the bird.

C. Because the bird could look after his mother.

D. Because John thought the bird could make his mother happy.

5. What does the sentence "It was delicious," really mean in the story?

A. His mother ate the bird.

B. His mother let the bird fly away.

C. His mother began to learn languages from the bird.

D. His mother thought it was the most expensive present in the world.

题型:单项选择题

对于平衡体系mA(g)+nB(g) 

 pC(g)+qD(g);△H<0.下列结论中不正确的是(  )

A.若温度不变,将容器的体积缩小到原来的一半,此时A的浓度为原来的2.1倍,则m+n<p+q

B.若平衡时,A、B的转化率相等,说明反应开始时,A、B的物质的量之比为m:n

C.若温度不变时,压强增大到原来的2倍,达到新平衡时,总体积一定比原来的

1
2
要小

D.若m+n=p+q,则往含有amol气体的平衡体系中再加入amol的B,达到新平衡时,气体的总物质的量等于2amol

题型:单项选择题

一般资料:求助者,女性,46岁,本科文化程度,教师。案例介绍:求助者是某中学高三毕业班的班主任,感到工作压力大,近期血压高、失眠。心理咨询师与求助者协商决定采用生物反馈训练,训练方案及程序是:咨询师先向求助者介绍生物反馈的原理、方法、特点和功效,采用肌电生物反馈的形式,第一周每天一次,每次一小时,以后每周两次,共4~8周。求助者取仰卧位,电极安放在前臂内侧,先测量肌电水平的基线值,然后进行反馈训练。训练时预先设定预置值,要维持反馈信号向肌电水平下降的方向变化,其中重要的是使求助者掌握放松技巧,其中还要安排家庭训练,鼓励求助者战胜疾病的信心,增强自我控制能力。

目前临床上常用的生物反馈仪包括()。

A.肌电生物反馈仪 

B.脑电生物反馈仪 

C.皮肤温度反馈仪 

D.磁带录像反馈仪

题型:单项选择题

脑膜瘤来源于()。

A.硬脑膜外层

B.硬脑膜内层

C.蛛网膜

D.硬脑膜

E.软脑膜

题型:单项选择题

在直流电源系统中,以下方法可以减小切换大负载时电网电压的波动:()。

A.采用精度高的调压器

B.采用晶体管稳压器

C.采用并联供电

D.采用单独供电

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