正确答案: C

风管垂直安装，支、吊架间距不应大于3m，但每根立管的固定件不应少于2个

题目：以下叙述中错误的是()

解析：C

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举一反三的答案和解析：

[单选题]信安标委中哪个小组负责信息安全管理工作?()

WG7

[单选题]所有编译程序的语法分析器都使用一个(29)，以支持语法分析的顺利进行。

栈

解析：解析：描述程序语言的语法是上下文无关语法，由它产生程序语言是上下文无关语言。这种语言与下推自动机等价，即每一个程序语言的语法，都可以用一个下推自动机来识别。下推自动机中的下推指的就是一个栈，一个下推自动机的模型如下图所示。一个语法分析器和一个下推自动机一样也由4部分构成：一个输入，一个输出，一个栈和一个控制器。对于某一个程序语言，可以根据不同的语法分析方法构造出不同的控制器，由控制器控制分析过程中的输入、输出和进栈操作。

[单选题]We know a computer is a machine that processes data(stored in main memory)into information, under control of a stored program. We also know that, internally, a computer is a binary machine; thus the data and the program instruictions must be stored in binary form. Characters are represented in(71). Numbers are stored as binary numbers, with each bit's positional value significant. A computer's main memory is divided into bytes, words or both(depending on the system), and each of these basic storage units is assigned an(72). Using this address, the processor can read or write selected bytes or words.The processor consists of a clock, an instruction control unit, an arithmetic and logic unit, and registers. Once a program is stored in main memory, the processor can begin to execute it. During(73), the instruction control unit fetches an instruction from main memory; during(74), the arithmetic and logic unit executes it. Precisely timed electronic pulses generated by the clock drive this basic(75)

a binary code

[单选题]在选择数据压缩算法时需要综合考虑(35)。

数据质量、数据量和计算的复杂度

解析：解析：通常在选择数据压缩算法时需要综合考虑数据质量、数据量和计算的复杂度。数据质量好是指恢复数据失真较小；数据量越小，代表压缩比越大，压缩算法越好；压缩算法对计算复杂度的要求是压缩算法简单，速度快。另外，选择压缩算法是还应考虑硬件实现的可能性。