共查询到20条相似文献，搜索用时 78 毫秒
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以《地表水环境质量标准》(GB3838-2002)为评价标准,选取10个水质评价指标,根据铜仁市锦江河13个监测断面多年的水质监测数据平均值,利用贝叶斯公式对铜仁市锦江河进行水质评价。通过评价结果可以看出在多年平均情况下除锦江东门桥下断面符合Ⅲ类标准外,其余12个断面水质均优于规定的Ⅲ类标准,符合Ⅱ类水质标准。 相似文献
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《西安文理学院学报》2015,(2)
通过对总硬度、水质高锰酸盐指数(CODMn)、氟化物、六价铬、氨氮、硝酸氮、盐硫酸盐等7个水质指标的监测,并对照《地表水环境质量标准》(GB 3838-2002)标准,对李家河水库上游水源地水质进行了分析和评价.结果表明:李家河水库上游水源地三处水样监测的指标大部分满足地表水环境Ⅱ类水相关标准,除两河桥和红门寺水样的CODMn指标超标外,总体水质良好. 相似文献
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根据对武夷学院校区黄泥垅水库7个监测点的水质监测结果,对武夷学院校区地表水环境质量进行评价.结果表明,武夷学院校区地表水水质CODcr、BOD5、NH3-N等指标均超过地表水环境质量Ⅲ类标准. 相似文献
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采用原子吸收分光光度法对淮南谢二矿塌陷区老鳖塘与刘岗塘水体中Fe、Pb和Zn等重金属的含量进行了检测。结果表明：老鳖塘与刘岗塘水体中的Fe含量分别超出了集中式生活饮用水地表水源地补充项目标准限值的3倍和5．9倍;两塘水体中的pb含量分别属于地表水环境质量国家标准的Ⅳ类和Ⅴ类水质范畴;Zn的含量均属于地表水环境质量国家标准的Ⅴ类水质范畴。综上可见淮南煤矿塌陷区水体的重金属污染状况较严重。 相似文献
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长江地表水是芜湖市重要的水源.近年来,由于大量的工农业废水和生活污水的排放,严重影响了长江芜湖段的地表水水质.通过实地调查及水质监测,结果发现各水质指标符合国家地表水环境质量标准,但存在局部污染.通过分析该段的局部污染问题,提出了相应的防治污染的建议. 相似文献
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文章通过对泰州市四市两区的地表水环境质量现状的分析,找出了地表水环境质量存在的问题和影响其水质的主要因素,提出了保护泰州市地表水环境质量的对策措施建议. 相似文献
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通过华阴市地表水12个代表断面的水污染状况调查,选用CODMn、NO3-N、NH4＋-N、Cr6＋、SS和pH六个水质指标,采用模糊综合评价法,按照地表水水质标准进行评价,得出华阴市地表水水质均为Ⅴ类,地表水污染严重。研究成果可作为华阴市地表水水质综合治理的依据,也可为华阴市污水排放处理提供科学依据。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献