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【单选题】
关于编码有下述说法： ①对字符集进行编码时，如果字符集中字符的编码都是其它字符的编码的前缀，则称这种编码称为前缀编码。 ②对字符集进行编码时，要求字符集中字符的编码都不是其它字符的编码的后缀，这种编码称为后缀编码。 ⑧不存在既是前缀编码又是后缀编码的编码。 ④哈夫曼编码属于前缀编码。 ⑤哈夫曼编码属于后缀编码。 ⑥哈夫曼编码对应的哈夫曼树是正则二。其中正确的是（）。A.
①③④⑥
B.
②④⑥
C.
②③④⑥
D.
①④⑥
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【单选题】狂犬病毒几乎可以感染所有温血动物，但造成人类感染的主要传染源是下列哪一种（）
A.
带病毒蝙蝠
B.
带病毒野生动物
C.
带病毒犬
D.
带病毒啮齿动物
E.
带病毒家畜
【单选题】狂犬病毒几乎可以感染所有温血动物，但造成人类感染的主要传染源是下列哪一种（）。
A.
带病毒犬
B.
带病毒蝙蝠
C.
带病毒家畜
D.
带病毒啮齿动物
E.
带病毒野生动物
【简答题】A．A couple of weeks with the computer first, and a few months with the word-processor later. B．About one month with the word processor first, and a two-month, part-time period with the computer use. C...
【简答题】完型填空。 The computer was one of the most important inventions of last century. The first computer was as large as a room. Now some computers are as 1 as television sets. Some computers can even be made ...
【单选题】听力原文：W: What started you in computers? M: I built my first computer when I was in Junior High School. I was an enthusiastic reader. I studied everything I could get my hands on. Then I turned to build...
A.
He turned to become an enthusiastic reader.
B.
He went on to build a machine for his Junior High School.
C.
He became obsessed with computer engineering.
D.
He was brushed by a hook.
【单选题】听力原文：M：When was the first computer built? W：It was built in 1944. M：Is it the same as the computers that we use now? W：No，it was as large as a room and worked very slow. M：But computers have become sm...
A.
It was as large as a TV set.
B.
It was as large as a room.
C.
It was as large as a book.
D.
It was as small as a palm.
【单选题】Which of the following is the first known analog computer?
A.
Personal computer
B.
Difference Engine
C.
Personal Computer
D.
Antikythera mechanism
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