以下关于总线型局域网的论述哪个是不正确的 ( )A.结点都通过相应的网卡直接连接到

题型:单项选择题

问题:

以下关于总线型局域网的论述哪个是不正确的 ( )

A.结点都通过相应的网卡直接连接到一条作为公共传输介质的同轴电缆或双绞线上

B.所有结点都可以通过总线传输介质发送或接收数据,但一段时间内只允许一个结点利用总线发送数据

C.如果同一时刻有两个或两个以上结点利用总线发送数据就会出现冲突,造成传输失败

D.只有总线型局域网存在冲突问题

考点:计算机等级考试网络技术三级网络技术笔试63
题型:单项选择题

在建设项目动态控制中,目标计划值是______。

A.国家定额

B.目标控制的目的

C.目标控制的效果

D.目标控制的依据

E.始终不变的

题型:单项选择题

患者因龋一次性治疗后1年,现咬合痛.就诊。检查:银汞充填体,近中舌尖劈裂,劈裂块松动,达龈下2mm,可及露髓孔,叩痛(±),牙龈未见明显异常。

该牙劈裂原因可能为()

A.洞深度不足

B.垫底物太少

C.材料调制

D.充填时操作问题

E.洞形制备时近中舌壁过薄

题型:单项选择题

     When The Grapes of Wrath(愤怒) was published on March 14, 1939, it created a national

sensation(轰动) for its description of the destructive effects of the Great Depression(大萧条) of the

1930s. By the end of April, it was selling 2,500 copies a day-a remarkable number considering the

hard economic times. In May, the novel was a number-one best-seller, selling at a rate of 10,000

copies a week. By the end of 1939, close to a half million copies had been sold.

     John Steinbeck was shocked by the tremendous response to his novel. Almost overnight, he found

himself involved in a great national debate over the migrant labor problem. Many people were shocked

by the poverty and hopelessness of the story, and others denied that such circumstances could happen in

America. Even people who had never read a book before bought a copy of The Grapes of Wrath. At $2.75 per copy, it was affordable and quickly sold out.

     However it was banned and burned in Buffalo, New York; East Saint Louis, Illinois; and Kern

County, California, where much of the novel is set. In fact, the novel remains one of the most frequently

banned books in the United States. The book was criticized sharply in Congress by Representative Lyle

Boren of Oklahoma, who called the novel's description of migrant living conditions a lie. Charges were

made that "obscenity"(淫秽) had been included in the book in large part to sell more copies. Eventually,

First Lady Eleanor Roosevelt stepped in to praise the book and defend Steinbeck against his critics. In

1940, the novel won the Pulitzer Prize.

     The popularity of the novel has endured(持久). It is estimated that it has sold fifteen million copies

since its publication. For almost sixty years, Steinbeck's novel has been a classic in American literature;

it has been translated into several languages, including French, German, and Japanese. The Grapes of

Wrath has also been a necessary part of the school curriculum in America since the end of World War II.

1. What does the underlined word "tremendous" probably mean?

A. good          

B. terrible          

C. dull      

D. great

2. Representative Lyle Boren of Oklahoma was__________. 

A. a crazy supporter of The Grapes of Wrath            

B. among the group against John Steinbeck

C. sympathetic to the migrant living conditions

D. criticized by the first lazy of that time

3.Which of the following is NOT mentioned as a reason why The Grapes of Wrath sold well?

A. It well describes people's life during that time.

B. The debate over it arose more readers' interest.

C. Readers were attracted by the obscenity in it

D. It was not expensive so people could afford it.

4.Which of the following is TRUE about The Grapes of Wrath?

A. It is about the migrant workers in America during 1940s.

B. The story mainly happened on California's grape farms..

C. Its description of the poor and hopeless life was a lie.

D. It remains a banned book in some places of the USA.

5. What can best prove the literature value of The Grapes of Wrath?

A. It was a number-one best-seller after its publication.

B. First Lady Eleanor Roosevelt praised it.

C. It has won many important prizes in America.

D. It survives the time and remains a classic.

题型:单项选择题

已经定义ch为字符型变量,以下赋值表达式中错误的是______。
A) ch='\' B) ch=62+3 C) ch=NULL D) ch='\xaa'

题型:单项选择题

在氧气浓度正常的情况下,高浓度的二氧化碳不会使呼吸系统失效。

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