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更多“Shannon codes and Huffman codes. Consider a random variable X which takes on fourvalues with probabi”相关的问题
第1题
Mution in gene that codes for p53 can result in()．
A．loss of an inhibitor protein，p21
B．loss of a transeription factor
C．uncontrolled cell growth and cancer
D．all of the above
第2题
David Eisenberg is mentioned______.
A．as a representative of official opinions
B．for the purpose of supporting Warren Brush
C．to provide evidence against straw houses
D．to show the importance of the building codes
第3题
People devised assembly language in order to ______.
A．simplify the process of programming
B．shorten the time to run a machine language
C．assign mnemonic code to each machine language command
D．translate the symbolic operands into mnemonic codes
第4题
A.测度方法包括基于数据量的信息测度方法和基于Shannon熵的信息量测度方法
B.计算机中基于数据量的信息测度常用单位包括：B.KB.MB.GB.TB.PB.EB
C.确定消息的信息量为1
D.对于非计算机处理的信息（如书籍报刊等），直接用发行种类、发行量或文本字数来进行测度
第5题
Tenure, the practice of assuring professors(1)continuation in their positions(2)they have passed successfully through a probationary period and provided they are not later found seriously deficient(3)a carefully specified procedure, is an important protection of academic freedom.(4)academic freedom of untenured professors, and of students' is not formally protected,(5)of equal concern in academic(6). Until the student movements of the 1960s, the United States lagged in(7)student academic(8); statements on student academic freedom(9)been issued by the AAUP and the American Civil Liberties Union (ACLU).
The U. S. Supreme Court has given legal(10)to academic freedom claims as falling(11), the First Amendment in decisions such(12)Sweezy v. New Hampshire (1957) and Perry v. Sinderman (1972).(13)such actions, challenges(14)academic freedom regularly occur and have become acute(15)critical stages in U.S. history. Following World War Ⅱ,(16)example, the credentials of academics suspected of Communist-party affiliation were often questioned, and teachers were dismissed as actual or(17)Communists.
In the late 1980s some American colleges and universities tried to prevent speech offensive to minority groups.(18)endorsing efforts to discourage such speech,(19)both faculty and students, the courts ruled explicit speech codes designed to enforce "political correctness" unconstitutional as(20)the First Amendment, and the ACLU condemned the codes as undermining academic freedom. The codes were abandoned by the end of 1993.
第7题
The underlined part "this tiny human" in Paragraph 2 refers to ______.
A．a chimp
B．Flores Human
C．Homo sapiens
D．Homo erectus
第9题
从下列英语叙述中，选出5条正确的叙述，把编号依次写在下面。
(1) The language translator converts the symbolic program into source program.
(2) The coded program written by a programmer is called an object program.
(3) COBOL is self-documenting unlike many technical language.
(4) FORTRAN has high capabilities for performing input/output operations and in handling nonnumeric data.
(5) Loading is a process through which the information on the diskettes or tapes is read by the input unit and stored in the proper memory location.
(6) The assemble program executes source codes directly by determining the meaning of each statement as it is encounted.
(7) Magnetic tape uses cylinders for finding data.
(8) Hexadecimal is used as a shorthand for the internal codes.
(9) Another name of diskette is floppy disk.
(10) An IF-THEN-ELSE selection technique can never be part of a loop.
(11) The most popular language for scientific computing is FORTRAN.
(12) It is much easier to access data in a file than in a database.
第10题
According to the author, scientists______.
A．have already proved that coffee is good for human health
B．have a long way to go before they find a way to study coffee
C．have avoided the cause-and-effect approach to study coffee
D．are still unable to figure out why coffee is good for us
第11题
The best title of the passage is ______ .
A．Newborn babies can use both hands well
B．Most human beings use their right hands better
C．Few human beings use their left hands
D．We live in a right-handed world
