下面的一段叙述中,空缺处信号的英文名称分别是( )。 “8237接收到通道的DM

题型:单项选择题

问题:

下面的一段叙述中,空缺处信号的英文名称分别是( )。
“8237接收到通道的DMA请求信号 后,向CPU发出总线请求信号 ,CPU接收到该信号后,在当前总线周期结束之后让出总线,并使总线允许信号 有效;当8237获得CPU送来的该信号后,便产生DMA响应信号 送到相应的外设端口,表示DMA控制器响应外设的DMA请求,从而进入DMA服务过程。”

A.DREQ、DACK、HRQ、HLDA
B.DREQ、HLDA、DACK、HRQ
C.HRQ、DREQ、DACK、HLDA
D.DREQ、HRQ、HLDA、DACK

考点:计算机等级考试PC技术三级PC技术笔试
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公元前8至公元前6世纪,希腊出现了约两百多个城邦。希腊“城邦”最突出的特征是:

A.小国寡民

B.民主健全

C.政体多样

D.法律完备

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毛 * * 提出党的工作重心由农村转移到城市,在城市工作中以发展生产力为中心工作是在( )。

A.《论人民民主专政》
B.《为争取国家财政经济状况的基本好转而斗争》
C.《在中 * * 党第七届中央委员会第二次会议上的报告》
D.《目前形势和我们的任务》

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某批进口货物,自载运货物的运输工具申报进境之日起已超过三个月,但其收货人或其代理人仍未向海关申报。对此,海关可以采取( )方式处理。

A.将货物扣留,待收货人或其代理人报关时罚款处理

B.将货物没收,全部变卖,货款上缴国库

C.将货物提取变卖,价款扣除各项税费后,余款留一年

D.经收货人申请可以返还,逾期五人申请的上缴国库

题型:单项选择题

蒸汽机中主要是以_________为燃料,在燃烧过程中它将存储的_________能转化为蒸汽的________能,再转化为机器的________能。

题型:单项选择题


Every artist knows in his heart that he is saying something to the public. Not only does he want to say it well, but he wants it to be something which has not been said before. He hopes the public will listen and understand—he wants to teach them, and he wants them to learn from him.
What visual artists like painters want to teach is easy to make out but difficult to explain, because painters translate their experiences into shapes and colors, not words. They seem to feel that a certain selection of shapes and colors, out of the countless billions possible, is exceptionally interesting for them and worth showing to us. Without their work we should never have noticed these particular shapes and colors, or have felt the delight which they brought to the artist.
Most artists take their shapes and colors from the world of nature and from human bodies in motion and repose; their choices indicate that these aspects of the world are worth looking at, that they contain beautiful sights. Contemporary artists might say that they merely choose subjects that provide an interesting pattern, that there is nothing more in it. Yet even they do not choose entirely without reference to the character of their subjects.
If one painter chooses to paint a gangrenous leg and another a lake in moonlight, each of them is directing our attention to a certain aspect of the world. Each painter is telling us something, showing us something, emphasizing something m all of which means that, consciously or unconsciously, he is trying to teach us.

The writer says that contemporary art contains ______ .

A.nothing but meaningless patterns

B.uninteresting aspects of the world

C.subjects chosen partly for their meaning

D.completely meaningless

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