单项选择题
An analog signal's characteristic quantity representing data may 66). at any instant, any value within a continuous(67). For example, an analog signal may follow continuously the values of another physical quantity representing data.A discrete signal is composed of(68)elements in time, each element having one or more characteristic quantities which can represent data. Examples of characteristic quantities are amplitude, waveform,(69), and position in time. A digital signal is a special case of discrete signals, in which data are represented by a(70)number of well-defined discrete values that one of its characteristic quantities may take in time.A．acquireB．collectC．assumeD．fetch
单项选择题 公称容积小于1000m3的球形罐常用的组装方法是（）。
单项选择题 Beethoven established himself as the greatest composer（）.
单项选择题 一种最早用于科学计算的程序设计语言是(15)；一种提供指针和指针操作且不存在布尔类型的、应用广泛的系统程序设计语言是(16)；一种适合在互联网上编写程序可供不同平台上运行的面向对象程序设计语言是(17)；一种在解决人工智能问题上使用最多的、有较强的表处理功能的函数程序设计语言是(18)；一种以谓词逻辑为基础的、核心是事实、规则和推理机制的实用逻辑程序设计语言(19)。
