The air environmental quality of Ma′anshan City in Anhui Province was investigated by using of the Air Pollution Index (API) method. The result showed that the air environmental quality at Ma’anshan City during 1997...The air environmental quality of Ma′anshan City in Anhui Province was investigated by using of the Air Pollution Index (API) method. The result showed that the air environmental quality at Ma’anshan City during 1997-2000 was Ⅱ-Ⅰ grade (the air quality is just good), and the critical pollutants were TSP or NOx. Compared with other methods, the usage of API method may accurately reveal and easily calculate the degree of air pollution, and let the local residences and environmental personnel clearly understand the circumstance of air pollution.展开更多
文摘The air environmental quality of Ma′anshan City in Anhui Province was investigated by using of the Air Pollution Index (API) method. The result showed that the air environmental quality at Ma’anshan City during 1997-2000 was Ⅱ-Ⅰ grade (the air quality is just good), and the critical pollutants were TSP or NOx. Compared with other methods, the usage of API method may accurately reveal and easily calculate the degree of air pollution, and let the local residences and environmental personnel clearly understand the circumstance of air pollution.
文摘无论是信息管理系统,还是多媒体应用系统,都需要强大的数据库来支持,访问数据库则是应用程序必须具备的基本功能之一。Visual Basic 6.0提供了多种访问数据库的方法,包括数据控件、DAO(数据访问对象)、RDO(远程数据对象)、VBSQL以及ADO(ActiveX Data Objects)等。本文分析比较了两类VB对数据库编程的常用方法,总结了各类方法在VB中对数据库编程的使用原则。