某机主存容量为16MB,cache容量为16KB,主存与cache每块都分为16B,

题型:单项选择题

问题:

某机主存容量为16MB,cache容量为16KB,主存与cache每块都分为16B,主存与cache地址变换采用直接映像方法。这种映像方法优点是算法简单,缺点是 (1) 。若访问的主存单元为B4AF45H,而且该单元已经装入cache,则cache的地址是 (2)

(1)处填()。

A.转换方法复杂

B.转换速度较慢

C.cache利用不充分

D.转换方法不直观

考点:计算机软件水平考试中级软件设计师中级软件设计师上午试题
题型:单项选择题

Space travel is nothing new. The first spacecraft with a human was sent up into space in 1961. Since then, people have not only traveled to space, but also many of them have lived there in space stations for some time.

The Soviet Union(前苏联) sent the first space station into space in 1971. This space station was called Salyut 1. Salyut 1 was designed as a place where people could live while they observed space and did experiments. The first group of astronauts lived there for 23 days. The Soviet Union went on to make seven more Salyut space stations. At about the same time, the United States built its own space station, called Skylab.

Astronauts visited and often lived in these space stations for a short time. However, it wasn’t until the late 1980s when The Soviet Union sent the Mir space station that people began to live in space for a longer time. Mir stayed in space from 1989 until 2001, when it was decided that the space station was too old and no longer safe to live in.

Living in space stations seems to be fun, but astronauts face many problems. One of them is food. All the meals on space station are put together on Earth and sent there by space shuttle. Because the food has to last a long time (sometimes up to three months), a lot of it has to be stored in cans. The space station does not have a fridge, but it has a cool room to keep fruit and vegetables fresh. Astronauts also eat many other foods such as dried meat that do not need special care.

Without the help of gravity, sitting down to eat can be tough. Astronauts sometimes have to fix themselves to the wall while eating. They also have to be very careful to that food does not float away.

小题1:Which of the following has the closest meaning to the underlined word “observed” in Paragraph 2?

A.Discovered

B.Checked

C.Watched

D.Fixed小题2: What can we infer(推断)from the passage?

A.Astronauts can never have a chance to eat fresh food when they live in space station.

B.The Soviet Union sent a total of 9 space stations into space in the 1970s and 1980s.

C.Astronauts could live in the Mir space station for no more than three weeks.

D.Space travel has quite a long history of more than 60 years.小题3:What is the best title of this passage?

A.Exploring Space

B.Space Travel

C.Living in Space

D.Space Stations

题型:单项选择题

材料 现在开幕的一党“国大”,不但使中共及第三方面最近在商谈中的协议成为不可能,并且最后破坏了政协以来的一切决议、停战协定与整军方案,隔断了政协以来和平商谈的道路……这一党“国大”还要通过一个所谓宪法,把“独裁”合法化,把“内战”合法化,把“分裂”合法化,把出卖国家与人民利益“合法”化。照这样做下去,中国人民一定要陷入苦痛的深渊。我们中 * * 党人坚决不承认这个“国大”。

——1946年11月16日《对国民党召开“国大”的严正声明》

(1)材料中的“一党国大”是指哪一会议?国民党召开这一会议的主要目的是什么?

(6分)

(2)材料中的“所谓宪法”是指哪一文件?它规定的政体及其恶劣影响分别是什么?

(6分)

(3)试依据上述材料概括中共对“一党国大”的态度,并结合所学知识说明其原因。

(6分)

题型:单项选择题

物体(刚体)在两个力作用下保持平衡的条件是:这两个力的大小相等,方向相反,且作用在同一条直线上。

题型:单项选择题

Which statement concerning locating signals in the GMDSS is FALSE().

A.Locating signals are transmitted by survival craft VHF transceivers

B.Locating signals are transmitted by SARTs

C.Locating signals are intended to facilitate the finding of a distressed vessel or its survivors

D.Locating signals are not transmitted by autoalarm generators

题型:单项选择题

油管线阀门冻裂怎么处理?

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