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What is the phenomenon called where different wavelengths of

题目
单选题
What is the phenomenon called where different wavelengths of light travel at different speeds?（）
A

OSNR

B

dispersion

C

light skew

D

attenuation

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相似问题和答案

第1题：

Which of the following is not among the basic features of a relational database?

A．It does not matter what order the rows are in.

B．It does not matter what order the columns are in.

C．Different columns should have different column names.

D．Different columns should have different data types.


正确答案：D

第2题：

As anoperating system repeatedly allocates and frees storage space，many physically separated unused areas appear．This phenomenon is called(71).

A．fragmentation

B．compaction

C．swapping

D．paging


正确答案：A
解析：随着操作系统反复分配与释放存储空间，就会出现许多不连续的未用物理区域，这种现象称为碎片。

第3题：

Sunlight consists ______different wavelengths of radiation.

(A) of

(B) by

(C) in

(D) to


正确答案：A 
解答参考：A consist后面可以跟介词in 和of，consist in 表示―主要在于……‖;consist of意思是―由……构成‖。【译文】太阳光由不同波长的射线构成。  

第4题：

What is the phenomenon called where different wavelengths of light travel at different speeds?()

A.OSNR

B.dispersion

C.light skew

D.attenuation


参考答案：B

第5题：

● As an operating system repeatedly allocates and frees storage space, many physically separated unused areas appear. This phenomenon is called （71） .

（71）

A. fragmentation

B. compaction

C. swapping

D. paging


正确答案：A

第6题：

计划的主要内容包括（），计划必须清楚地确定和描述这些内容。

A.What，Why，Who，Where，When，Howmany，Howmuch

B.What，Why，We，Where，When，Howto，Howmuch

C.What，Why，We，Where，When，How，Howmuch

D.What，Why，Who，Where，When，How，Howmuch


正确答案：D

第7题：

The purpose of two questions in the second paragraph is to ________.

[A] demonstrate why people are amused

[B] display what people laugh at

[C] bring to light the phenomenon of laughter

[D] accent what a phenomenon laughter really is


正确答案：D
在文章的第二段中，作者的两个反问句都是针对笑及笑时的表情的，其目的在于强调笑这种现象究竟是什么。所以本题的正确答案应当为D。

第8题：

What is antonymy and what are its different types?


参考答案：Antonymy refers to the relationship between two or rarely more words of the same language, belonging to the same part of speech, identical in style. and nearly identical in distribution, associated and used together so that their denotative meanings render contrary or contradictory notions. There are three types of antonymy1) Complementary antonymy refers to the relation between two words that the denial of one member implies the assertion of the other, and vice versa.e.g. male vs. Female; alive vs. dead; boy vs. girl; odd vs. evenThe relation between the members of the pair of complementary antonyms can be best represented in the following diagram: 2) Gradable antonymy refers to the relation between two words that the two words in question are the two extremes between which different degrees of grades can be distinguished. See more examples as the following:good vs. bad; fat vs. skinny; wide vs. narrow; fast vs. slowMany pairs of gradable antonyms contain one marked term and one unmarked, e.g. old/young, heavy/light, fast/slow where the second term is more restricted in distribution than the first. The relation between members of the pair of gradable antonymy can be represented in the following way: 3) Relational antonymy refers to the relation between the two items do not constitute a positive-negative opposition, and the existence of one of the pair presupposes the existence of the other, or one of them cannot be used without suggesting the other. See more examples as the following:e.g. predecessor vs. successor; parent vs. child; teacher vs. student lend vs. borrow; employer vs. employee; buy vs. sell

第9题：

For many students,university is the place ______ they will be first exposed to different cultures and different people.

A.which

B.where

C.what


答案：B

解析：

题为Where 引导的时间地点状语从句。全句的意思为，对许多学生来讲，大学是第一个他们接触到不同文化，不同人群的地方。故选B。

第10题：

What term is used to describe the process where one frame is placed into a different type of frame?()

A. Framing

B. De-encapsulation

C. Encapsulation

D. De-framing

E. None of the above


参考答案：C

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