Objective:To understand the knowledge level and attitude of school students about AIDS and their behavious factors,and to provide accordance for school propagand plans.

目解中专生艾滋病知、态、行现状，为学校制定艾滋病宣传策略提依据。

The paper expounds in detail the relation between oil density and metering and suggests that it is necessary to propagand metrical knowledge to customers.

详细阐述油品储存收发过程中密度与计量关系,并提客户宣传计量知识必要性。