下列的哪个赋值语句是正确的A. 不能根据自由表建立查询 B. 只能根据自由表建立查询

题型:单项选择题

问题:

下列的哪个赋值语句是正确的

A. 不能根据自由表建立查询

B. 只能根据自由表建立查询

C. 只能根据视图建立查询

D. 可以根据数据库表、自由表或视图建立查询

考点:计算机等级考试JAVA计算机二级(Java)14
题型:单项选择题

申报地价和公告地价是按()划分的。

A.土地权利分类

B.土地价格的形成方式

C.政府管理手段

D.土地价格表示方法

题型:单项选择题

一块梯形稻田,上底是100米,下底是60米,高30米,这块稻田的面积是多少平方米?

题型:单项选择题

NO是大气污染物之一,但少量NO在人体内具有扩张血管、增强记忆的功能。NO密度比空气大,难溶于水,通常条件下极易与氧气反应。实验室收集NO的装置是

A.只能用排水法

B.既能用排水法又能用向上排空法

C.只能用向上排空法

D.既能用排水法又能用向下排空法

题型:单项选择题

胃窦部溃疡的最佳手术方式是()

A.胃大部切除胃十二指肠吻合术

B.胃大部切除胃空肠吻合术

C.高选择性迷走神经切断术

D.胃窦切除,选择性迷走神经切除术

E.迷走神经干切除术

题型:单项选择题

阅读理解。

     London has a new magazine. But it's not printed on paper. Everyone who has a television can receive

it because it is on TV.

    In order to read this magazine you have to have a decoder. Each page of it is numbered, so you only

have to dial the number to choose which subject you want to read about. There's a wide

choice- everything is included from cooking to the latest sports news.

    If you want to read the news, the first thing you have to do is to turn to the index page which has an

easy-to-remember page number, 100 for example. Then you start choosing what you want to read. The

news is on pages 101 to 109, so you push out the numbers and the news appears written across your

screen. Perhaps you want to go out in the afternoon, so you press 181, and a brightly colored weather

map appears on the screen. But the weather is terrible so you decide to go shopping and dial 162 for a

list of the week's best bargains. But should you drive or take the train ? To answer the question you only

have to press 189 for the traffic report. It's very simple to use. But probably the best thing about the

service is that it's being updated all the time. Journalists type new material directly onto the screen and

whole pages of the magazine can be replaced in minutes.

     London has already had three services. One, transmitted(传输)by ITV, is called ORACLE, while the

other two, on BBC, are called CEEFAX, because they let you see facts. Although CEEFAX and

ORACLE have been operating for some time, they have not been well publicized. BBC engineers do not

think that their idea will ever replace books and newspapers because they can be taken with you

everywhere. But many people agree that this is a breakthrough as great as the invention of printing, which

could change not just our reading habits but our whole way of life.

1.What is unusual about the mew magazine in London?

A. You can find any subject you want in it.

B. No paper is used to print the magazine.

C. There 1,000 page numbers in the index.

D. The speed of transmitting is astonishing.

2. It's clearly seen from the passage that ________.

A. it takes long for the service of the magazine to be updated

B. most of the postmen will be out of work someday

C. the readers can get all kinds of information without leaving home

D. everyone can read the magazine if there is a television at hand

3. According to the passage, the "decoder" is used to help people to ________.

A. read the information transmitted by TV signals

B. broadcast special TV programs at home and abroad

C. dial the number to choose which subject you want to read about

D. find the exact page in which you can get information you need

4.The passage is mainly about           .

A. a new magazine printed in London

B. a popular TV program with three services

C. a great breakthrough in printing

D. an up-to-date way of keeping up to date

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