P / a , fl / py ratios and ring numbers of pahs were used to assess the origins of the pollutants , suggesting possible sources such as combustion of coal , wood and petroleum pyrolysis P / a 、 fl / py比值、 pahs环数以及烷基化pahs表明胶州湾表层沉积物中pahs几乎全部由人类活动产生，来源为煤炭燃烧、木材燃烧、石油类高温裂解及油类污染。
Information contained in this website may be re - disseminated or reproduced , provided that home affairs bureau as the source of information is acknowledged and that the re - dissemination or reproduction is for non - commercial use 本网站的资料可以再行发布或复制，但必须确认资料来源为民政事务局，而有关资料亦须用作非商业用途。
Taking the origin of curriculum aim as the theory basis , analysis is made about the shortcoming in da wo junior school in this aspect and the adjusting direction , get a result is that the adjusting direction is vocationalization 以课程目标来源为理论基础，分析原来大窝镇中学课程目标的不足。并结合该镇初中教育的具体情况，分析其课程目标调整的方向，认为职业化是其课程调整的方向。
