The primary purpose of careful code layout is to _______.
A. please ourselves
B. improve readability
C. conform to standards
D. help the SQA team
查看答案
Which of the following statements about programming languages is true?
A. The best programming language means that it can be suitable for any project.
B. We should always choose the best programming language for the target system.
C. There is no the best programming language. Each language has its own advantages and disadvantages. We should always choose the most suitable one for the target system.
D. Java is the best programming language nowadays.
Which of the following statements is wrong?
A. One statement of a third-generation language can be compiled to 5 or 10 machine code instructions.
B. One statement of a fourth-generation language can be compiled to 30 or even 50 machine code instructions.
C. Third-generation language includes Java, C, SQL, and etc.
D. Fourth-generation language can be selected for implementing a database application.
电场强度矢量的终点随时间变化的方式称为电磁波的极化。电磁波的极化可分为三种，线极化、圆极化和椭圆极化。
关于电磁波在导体中的传播描述不正确的是（ ）
A. 当电磁波在金属中传播一段距离后其能量会迅速地衰减
B. 电磁波在金属中传播时存在趋肤效应
C. 在同种金属材料中，电磁波的穿透深度和波的频率无关
D. 在同种金属材料中，电磁波的频率越高则在金属中的穿透深度越小
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