定义过程 一、分成两类:sub过程(子过程)和 fungtion过程(函数过程) 二、定义子过程方法:

一、数组的概念 数组与数组元素 数组是用一个统一的名称表示的、顺序排列的一组变量。数组中的变量 称为数组元素,用数字(下标)来标识它们,因此数组元素又称为下标变 量

文件概述 文件是把数据记录在外存储器上的集合。 数据的特定的存放方式叫做文件结构,vb中文件有记录组成,记录由 字段组成,字段有字符组成

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一、 学习和掌握投入产出分析的基本原理 二、学习和掌握在环境决策中进行投入产出分析的方法和步骤

A ring that contains at least one heteroatom (an atom other than carbon) is called a heterocycle, and a substance based on a heterocyclic ring is a heterocyclic compound. Heterocyclic compounds containing N, O or S are by far the most common

Phenols are like alcohols in being able to form strong intermolecular hydrogen bonds. Phenols have higher boiling points than hydrocarbons of the same molecular weight. A modest solubility in water

Carbon’s ability to form strong covalent bonds to other carbon atoms is the single property of the carbon atom that — more than any other—accounts for the existence of a field of study called organic chemistry. Carbon’s ability to form as many as four strong bonds to other carbon atoms, and to form strong bonds to hydrogen, oxygen, sulfur, and nitrogen atoms as well

Energy and the Relative Stability Kinetic energy is the energy an object has because of its motion. Potential energy is stored energy. It exists only when an attractive or repulsive force exists between objects

Cycloalkanes with only one ring are named by attaching the prefix cyclo- to the names of the alkanes possessing the same number of carbon atoms