无线网络是计算机网络与哪项技术相结合的产物( )。 A.蓝牙技术 B.红外技术

题型:单项选择题

问题:

无线网络是计算机网络与哪项技术相结合的产物( )。

A.蓝牙技术
B.红外技术
C.无线通信技术
D.卫星通信技术

考点:计算机等级考试网络工程师计算机网络工程师
题型:单项选择题

下列说法正确的是[ ]

A.硼的第一电离能比铍大

B.二氧化碳和过氧化钠反应后,若固体质量增加了28 g,则消耗二氧化碳22.4L

C.在反应2Al+2NaOH+2H2O=2NaAlO2+3H2↑中还原剂和氧化剂的物质的量之比为1:2

D.常温下用pH=3的某酸溶液与pH=11的氨水等体积混合,所得溶液可能显酸性或碱性或中性

题型:单项选择题

哪一项符合SP的特点()。

A.交流电位,几乎无潜伏期,波形与刺激声波形相同

B.负直流电位,无潜伏期和不应期

C.潜伏期随刺激强度增加而增加

D.反映听觉末梢最敏感的电位

E.交流电位,振幅随声强减少

题型:单项选择题

阅读理解。

     What happens to a teenage kid when the world he thought he knew suddenly changes? Find out in Little

Brother by American author Cory Doctorow. It is a fascinating book for a new generation of sci-fi readers.

     Marcus Yallow, 17, from San Francisco is much more comfortable in front of a computer than obeying

the rules of society. Smart, fast and wise to the ways of the networked world, he has no trouble outwitting

(骗过) his high school's monitoring system. This way he and his friends get to head off to play a popular

online game in real life.

     While they are playing, a bomb explodes on the Bay Bridge. Marcus stops a military vehicle to get help for

his injured friend, but this simple act throws him into a Department of Homeland Security (DHS) secret prison.

There he is treated as a possible terrorist. He is eventually let go after four days, but his injured friend

disappears.

     When he returns, Marcus discovers that there are many "security measures" in place and that now all

citizens are treated like potential terrorists. While some consider this government action necessary for public

safety, Marcus sees this as a complete destruction of the rights he is supposed to have as a citizen.

     He knows that no one will believe his story, which leaves him with only one thing to do: to take down the

DHS himself. He helps organize a large network called Xnet to spread the truth, anonymously (匿名地).

     The book presents a young man who is irresponsible, but learns about himself, and grows, in the course

of the story. As part of this learning and growing he becomes aware of very serious issues about his society.

1. What kind of article does this passage belong to?

A. A fascinating story.

B. A book review.

C. News report

D. A TV programme

2. The underlined word destruction in the passage means _____.

A. damage

B. reward

C. ruin

D. protection

3. Marcus Yallow was sent to prison because _____.

A. he killed his friend

B. he bombed a military vehicle

C. he did something that a possible terrorist could do

D. his injured friend disappeared

4. From the second paragraph we can infer that _____.

A. Marcus Yallow is much more comfortable obeying the rules of society

B. Marcus Yallow is smart, fast and wise in real life

C. Marcus Yallow always plays online games in real life

D. Marcus Yallow is expert at the network world

题型:单项选择题

某班有50名学生,参加语文竞赛的有28人,参加数学竞赛的有23人,参加英语竞赛的有 20人,每人至多参加两科,那么参加两科的最多有多少人( )

A.28
B.35
C.39
D.42

题型:单项选择题

供滴入耳腔内的外用液体制剂()

A.涂膜剂

B.洗剂

C.滴鼻剂

D.滴耳剂

E.滴牙剂

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