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从供选择的答案中选出应填入下面一段英文中______内的正确答案。 A light-emitting diode （LED) is a semic

从供选择的答案中选出应填入下面一段英文中______内的正确答案。

A light-emitting diode (LED) is a semiconductor(1)that emits visible light when an electric current passes throughit.The light is not particularly(2), but in most LEDs it is monochromatic, occurring at a single(3). The output from an LED can range from red (at a wavelength of approximately 700 nanometers) to blue-violet (about 400 nanometers). Some LEDs(4)infrared (IR) energy (830 nanometers or longer); such a device is known as an infrared-emitting diode (IRED).

An LED or IRED(5)of two elements of processed material called P-type semiconductors and N-type semiconductors. These two elements are(6)in direct contact, forming a region called the P-N junction. In this respect, the LED or IRED(7)most other diode types, but there are important(8). The LED or IRED has a transparent package, allowing(9)or IR energy to pass through. Also, the LED or IRED has a large PN-junction area whose(10)is tailored to the application.

供选择的答案：

1．wavelength 2．shape 3．emit 4．device 5．resembles

6．bright 7．visible 8．consists 9．differences 10．placed

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发布时间：2020-11-26

更多“从供选择的答案中选出应填入下面一段英文中______内的正确答案。 A light-emitting diode （LED) is a semic”相关的问题

第1题

从供选择的答案中选出应填入下面一段英文中______内的正确答案。 Java was introduced by Sun Microsystems

从供选择的答案中选出应填入下面一段英文中______内的正确答案。

Java was introduced by Sun Microsystems in 1995 and instantly(1)created a new sense of the interactive possibilities ofthe Web. Both ofthe major Web browsers include a Java(2)virtual machine. Almost all major operating system developers (IBM, Microsoft, and others) have added Java(3)compilers as part oftheir product offerings.

The Java virtual machine includes an optional just-in-time compiler that(4)dynamically compiles bytecode into executable code as an alternative to(5)interpreting one bytecode instruction at a time. In many(6)cases, the dynamic JIT compilation is faster than the virtual machine interpretation.

JavaScript should not be(7)confused with Java. JavaScript, which originated at Netscape, is interpreted at a higher level, is easier to learn than Java, but(8)lacks some of the portability of Java and the speed of bytecode. Because Java applets will run on almost any operating system without(8)requiring recompilation and because Java has no operating system-unique extensions or variations, Java is generally regarded as the most strategic(10)language in which to develop applications for the Web.

供选择的答案：

1．confused 2．compilers 3．dynamically 4．requiring 5．cases

6．interpreting 7．language 8．virtual 9．created 10．lacks

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第2题

从供选择的答案中选出应填入下面一段英文中______内的正确答案。 File Transfer Protocol （FTP),a standard

从供选择的答案中选出应填入下面一段英文中______内的正确答案。

File Transfer Protocol (FTP),a standard Internet protocol, is the simplest way to(1)exchange files between computers on the Internet. Like the Hypertext Transfer Protocol (HTTP), which transfers displayable Web(2)pages and related files, and the Simple Mail Transfer Protocol (SMTP), which transfers e-mail, FTP is an(3)application protocol that uses the Internet's TCP/IP protocols. FTP is commonly used to transfer Web page files from their creator to the computer that acts as their(4)server for everyone on the Internet. It's also commonly used to(5)download programs and other files to your computer from other servers.

As a user, you can use FTP with a simple(6)command line interface (for example, from the Windows MS-DOS Prompt window) or with a commercial program that offers a graphical user(7)interface. Your Web browser can also make FTP requests to download programs you select from a Web page. Using FTP, you can also(8)update (delete, rename, move, and copy) files at a server. You need to logon to an FTP server. However, publicly available files are(9)easily accessed using anonymous FTP.

Basic FTP support is usually provided as part of a suite of programs that come with TCP/IP. However, any FTP(10)client program with a graphical user interface usually must be downloaded from the company that makes it.

供选择的答案：

1．download 2．exchange 3．update 4．interface 5．server

6．client 7．command 8．pages 9．easily 10．application

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第3题

试题5 从供选择的答案中，选出应填入下面叙述中的__内的最确切的解答，把相应编号写在答卷的对应栏内。 Motif是Unix下的__A__。X－Windows是基于__B__的系统软件。管道是Unix中的一个重要功能，它通过__C__，从__D__传递资料。在Unix中，用户可以用一个简短的命令来替代经常使用的较复杂的命令行，这可用__E__命令来实现

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第4题

从供选择的答案中选出应填入下列英文语句中______内的正确答案。 The UNIX system contains several （)

从供选择的答案中选出应填入下列英文语句中______内的正确答案。

The UNIX system contains several()that comply with the definition of a software tool. Among them are programs that(2)and manipulate text, programs that analyze text files,and programs that format text files to produce high quality hard copy suitable for(3).

One characteristic ofthese tools is that they operate on ordinary text(4), which means that you can read the input and output files by simply listing them on a(5)．

供选择的答案：

(1) terminal (2) keyboard (3) programs (4) programming (5) files

(6) directories (7) create (8) build (9) publication (10) painting

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第5题

试题6 从供选择的答案中，选出应填入下面叙述中__内的最确切的解答，把相应编号写在答卷的对应栏内。通常，软件开发环境可由环境机制和工具集构成。按功能划分，环境机制又可分为__A__；工具集也可分为贯穿整个开发过程的工具和解决软件生命周期中某一阶段问题的工具，分别属于上述两类工具的是__B__。软件开发环境的核心是__C__。软件开发环境具有集成性、开放性、__D__、数据格式一致性、风格统一的用户界面等特性，因而能大幅度提高软件生产率。其中开放性是指__E__

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第6题

从供选择的答案中选出正确的答案填入下面的()中。块间联系和块内联系是评价程序模块结构质量的

从供选择的答案中选出正确的答案填入下面的（)中。块间联系和块内联系是评价程序模块结构质量的

从供选择的答案中选出正确的答案填入下面的()中。

块间联系和块内联系是评价程序模块结构质量的重要标准。联系的方式、共用信息的作用、共用信息的数量和接口的(A)等因素决定了块间联系的大小。在块内联系中，(B)的块内联系最强。

SD方法的总的原则是使每个模块执行(C)功能，模块间传送(D)参数，模块通过(E)语句调用其他模块，而且模块间传送的参数应尽量(F)。

此外，SD方法还提出了判定的作用范围和模块的控制范围等概念。SD方法认为，(G)应该是(H)的子集。

供选择的答案：

A：①友好性

②健壮性

③简单性

④安全性

B：①巧合内聚

②功能内聚

③通信内聚

④信息内聚

C：①一个

②多个

D：①数据型

②控制型

③混合型

E：①直接引用

②标准调用

③中断

④宏调用

F：①少

②多

G～H：①作用范围

②控制范围

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第7题

从下面提供的答案中选出应填入下列英文语句中______内的正确答案。 Software quality assurance is now an

从下面提供的答案中选出应填入下列英文语句中______内的正确答案。

Software quality assurance is now an(1)sub-discipline of software engineering. As Buckly and Oston point out,(2)software quality assurance is likely to lead to an ultimate(3)of software costs. However, the major hurdle in the path of software management in this area is the lack of(4)software standards. The development of accepted and generally applicable standards should be one ofthe principal goals of(5)in software engineering.

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第8题

2．从下面提供的答案中选出应填入下列英文语句中______内的正确答案。 Software quality assurance is now a

2．从下面提供的答案中选出应填入下列英文语句中______内的正确答案。

Software quality assurance is now an(1)sub-discipline of software engineering. As Buckly and Oston point out,(2)software quality assurance is likely to lead to an ultimate(3)of software costs. However, the major hurdle in the path of software management in this area is the lack of(4)software standards. The development of accepted and generally applicable standards should be one ofthe principal goals of(5)in software engineering.

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第9题

从下列选择中选出正确的填入括号中墨菲定律（）

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第10题

当算法中需要用一个模块去计算多种条件的复杂组合，并根据这些条件完成适当的功能时，从供选择的答案中，选出合适的描述工具（）

A.程序流程图

B.N-S图

C.PAD图

D.判定表

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