微型计算机系统中CPU与外设之间有哪三种基本数据输入输出方式?试分析它们各自优缺点。

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问题:

微型计算机系统中CPU与外设之间有哪三种基本数据输入输出方式?试分析它们各自优缺点。

考点:微机原理微机原理题库
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In WAR MADE EASY Norman Solomon demolishes the myth of an independent American press zealously guarding sacred values of free expression. Although strictly focusing on the shameless history of media cheerleading for the principal post World War II American wars, invasions, and interventions, he calls into question the entire concept of the press as some kind of institutional counterforce to government and corporate power.
Many of the examples compiled in this impeccably documented historical review will be familiar to readers who follow the news on the Internet. But such examples achieve fresh impact because of the way Solomon has organized and analyzed them. Each chapter is devoted to a single war hawk argument ("America Is a Fair and Noble Superpower," "Opposing the War Means Siding with the Enemy," "Our Soldiers Are Heroes, Theirs Are Inhuman"), illustrated with historical examples from conflicts in the Dominican Republic, E1 Salvador, Vietnam, Grenada, Panama, Kosovo, both Iraq wars, and others in which the media were almost universally enthusiastic accomplices.
The book should really be subtitled "War reporting doesn’t just suck, it kills. "it makes you feel like demanding a special war crimes tribunal for corporate media executives and owners who joined the roll-up to" shock and awe" as non-uniformed psywar ops. To be sure, this would raise the issue of whether or not following orders might suffice for the defense of obedient slaves such as Mary McGrory and Richard Cohen, who performed above and beyond the call of duty. "He persuaded me, " ncGrory gushed(热情洋溢地表达) the morning after Colin Powell addressed a plenary session of the United Nations on February 5, 2003, declaring that Iraq had weapons of mass destruction. " The cumulative effect was stunning. "In the same Washington Post edition, Cohen wrote.
The evidence he presented to the United Nations—some of it circumstantial, some of it absolutely bone-chilling in its detail—had to prove to anyone that Iraq. not only hasn’t accounted for its weapons of mass destruction but without a doubt still retains them. Only a fool—or possibly a Frenchman—could conclude otherwise.
Solomon demonstrates how this kind of peppy prewar warm up degenerates into drooling and heavy breathing once the killing begins. As if observing a heavy metal computer game, the pornographers of death concentrate on the exquisite craftsmanship and visual design of the murder machines and the magnificence of the fiery explosions they produce.

Solomon mentioned the computer game in order to ______.

A.blame the press for its guilt in the war

B.compare the prewar preparations and the real war

C.stress the large scale of mass destruction

D.describe the visual effects of the murder machines

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根据图示情景和范例,编写计算题,并完成相关内容。

【情景l】  要配制一定质量分数、一定质量的氯化钾溶液,应该怎么操作?  

(1)编题范例   配制10%的氯化钾溶液50g,分别需氯化钾固体和水各多少?     

(2)配制该溶液的操作步骤     

①计算:     

②称量:用托盘天平称取所需固体,再用______mL的量筒量取所需的水;    

③溶解:将称得的氯化钾固体放入烧杯中,再倒入量取的水,用玻璃棒充分搅拌;     

④半瓶:将配制的溶液倒入试剂瓶,并贴上标签。     

【情景2】  已知一定质量分数、一定质量的氢氧化钾溶液与一定质量的盐酸反应,得到只有一种溶质的溶液,求算反应后溶液的溶质质量分数。

(1)编写题目_____________________________________________。

(2)计算过程

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先锋霉素皮内试验的进皮剂量是

A.20单位/0.1 ml
B.250单位/0.1 ml
C.15单位/0.1 ml
D.0.25 mg/0.1 ml
E.50 μg/0.1 ml

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剖面样品,每层样品采集数量一般()左右。

A、1kg

B、5kg

C、0.5kg

D、2.5kg

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国家基本水文测站因(),所在地人民政府和有关水行政主管部门应当采取措施,组织力量修复,确保其正常运行。

A.不可抗力遭受破坏的

B.人为原因遭受破坏的

C.标准洪水遭受破坏的

D.老化失修的

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