C**T 发帖数: 5379 | 1 非礼猫在最新言论中大量使用了PCV一词,恕本人才疏学浅,实在不明白PCV是个神马东
西。不过,当今网络时代只要会搜索就能成为砖家,本人不才,特查询wikipedia,结
果让我大跌眼镜。请见screenshot。弄了半天,我还是没搞明白PCV是个啥。请大拿们
指点一二,这东西为啥能致癌? |
m********2 发帖数: 3732 | 2 估计想说PVC,全名为Polyvinylchlorid,主要成份为聚氯乙烯,另外加入其他成分来
增强其耐热性,韧性,延展性等。 |
C**T 发帖数: 5379 | 3 后来仔细一想,对了,貌似常常听到PVC这个词。PVC是个神马东西呢?wikipedia真是
好东西。
Polyvinyl chloride, commonly abbreviated PVC, is the third-most widely
produced plastic, after polyethylene and polypropylene.[4] PVC is used in
construction because it is more effective than traditional materials such as
copper, iron or wood in pipe and profile applications.
如果还需要进一步解释,大家可以看看自己家里厨房,洗手间,地下室的白色管子,那
可一根根都是PVC做的。以下是非礼猫的原话:
“私营研究机构healthystuff.org做过相关研究,他们研究的对象仅仅是针对PCV材料
在车里使用的多少(这个估计还不包括这回央视曝光的沥青材料),结果是日本和韩国
生产的汽车,PCV用的最少;但同时来讲亚洲其他国家组装的车子这种材料却翻倍;欧
洲地区组装的车子,PCV用的最多,是世界上其他地区生产的车子平均用量的两倍还要
多;北美地区没有总结平均用量,只是说在“减少PCV使用”这个行动上,北美地区的
厂家落后于亚洲和欧洲。”
不知道你是不是指PVC阿?PVC和主题中的致癌又有神马关系? |
f******t 发帖数: 7283 | 4 已经在原贴里专门发文更正了,估计他忘了按F5刷新浏览器。
【在 m********2 的大作中提到】 : 估计想说PVC,全名为Polyvinylchlorid,主要成份为聚氯乙烯,另外加入其他成分来 : 增强其耐热性,韧性,延展性等。
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C**T 发帖数: 5379 | 5 哦,看来这回学乖了,赶紧改,免得又被某化学版ID过来抓现行。
不过我倒奇怪了,你连这么常见的名词都能写错,还大谈材料的危害,不免让人怀疑你
的业务水平。就好比一个人大谈网络技术,文中却屡次出现HTPP,太影响credibility
了。
【在 f******t 的大作中提到】 : 已经在原贴里专门发文更正了,估计他忘了按F5刷新浏览器。
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t**********3 发帖数: 12623 | 6 http://en.wikipedia.org/wiki/Crankcase_ventilation_system#Posit
Positive crankcase ventilation (PCV)
During World War II, however, a different type of crankcase ventilation had
to be invented to allow tank engines to operate during deep fording
operations, where the normal draft tube ventilator would have allowed water
to enter the crankcase and destroy the engine.[3] The PCV system and its
control valve were invented to meet this need, but no need for it on
automobiles was recognised.
In 1952, Professor A. J. Haagen-Smit, of the California Institute of
Technology at Pasadena, postulated that unburned hydrocarbons were a primary
constituent of smog, and that gasoline powered automobiles were a major
source of those hydrocarbons. After some investigation by the GM Research
Laboratory (led by Dr. Lloyd L. Withrow), it was discovered in 1958 that the
road draft tube was a major source, about half, of the hydrocarbons coming
from the automobile. GM's Cadillac Division, which had built many tanks
during WWII, recognized that installation of PCV on vehicles could bring the
first major reduction in automotive hydrocarbon emissions. After confirming
the PCV valves' effectiveness at hydrocarbon reduction, GM offered the PCV
solution to the entire U.S. automobile industry, royalty free, through its
trade association, the Automobile Manufacturers Association (AMA).[citation
needed] The PCV system thus became the first real vehicle emissions control
device.
Positive crankcase ventilation was first installed on a widespread basis by
law on all new 1961-model cars first sold in California. The following year,
New York required it. By 1964, most new cars sold in the U.S. were so
equipped by voluntary industry action so as not to have to make multiple
state-specific versions of vehicles. PCV quickly became standard equipment
on all vehicles worldwide because of its benefits not only in emissions
reduction but also in engine internal cleanliness and oil lifespan.[1][4]
In 1967, several years after its introduction into production, the PCV
system became the subject of a U.S. federal grand jury investigation, when
it was alleged by some industry critics that the AMA was conspiring to keep
several such smog reduction devices on the shelf to delay further smog
control. After eighteen months of investigation by U.S. Attorney Samuel
Flatow, the grand jury returned a "no-bill" decision, clearing the AMA, but
resulting in a "Consent Decree" that all U.S. automobile companies agreed
not to work jointly on smog control activities for a period of ten years.[
citation needed]
In the decades since, legislation and regulation of vehicular emissions has
tightened substantially, and the toxic emissions of cars and light trucks
have decreased substantially. Today's petrol engines continue to use PCV
systems. |
K*******a 发帖数: 706 | 7 您是网络码工?是的话那得握一下手!
credibility
【在 C**T 的大作中提到】 : 哦,看来这回学乖了,赶紧改,免得又被某化学版ID过来抓现行。 : 不过我倒奇怪了,你连这么常见的名词都能写错,还大谈材料的危害,不免让人怀疑你 : 的业务水平。就好比一个人大谈网络技术,文中却屡次出现HTPP,太影响credibility : 了。
|
C**T 发帖数: 5379 | 8 不是,不过http我还是听说过的:D
【在 K*******a 的大作中提到】 : 您是网络码工?是的话那得握一下手! : : credibility
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w********r 发帖数: 14958 | 9 错。
有credibility的人,犯错才会影响声誉。
早就没credibility的人,哪来的影响一说?
credibility
【在 C**T 的大作中提到】 : 哦,看来这回学乖了,赶紧改,免得又被某化学版ID过来抓现行。 : 不过我倒奇怪了,你连这么常见的名词都能写错,还大谈材料的危害,不免让人怀疑你 : 的业务水平。就好比一个人大谈网络技术,文中却屡次出现HTPP,太影响credibility : 了。
|
C**T 发帖数: 5379 | 10 你提醒得是
【在 w********r 的大作中提到】 : 错。 : 有credibility的人,犯错才会影响声誉。 : 早就没credibility的人,哪来的影响一说? : : credibility
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K*******a 发帖数: 706 | 11 唉,浪费了俺的感情XD不过还是握一下手吧
【在 C**T 的大作中提到】 : 不是,不过http我还是听说过的:D
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C**T 发帖数: 5379 | 12 好。我对网络马工一直都是崇拜有加。没有你们,哪来的这么丰富的信息世界?
【在 K*******a 的大作中提到】 : 唉,浪费了俺的感情XD不过还是握一下手吧
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K*******a 发帖数: 706 | 13 听您这么一说俺压力甚大……
【在 C**T 的大作中提到】 : 好。我对网络马工一直都是崇拜有加。没有你们,哪来的这么丰富的信息世界?
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w********r 发帖数: 14958 | 14 哪来这么些四六不懂, google两下就串用各种概念名词的大虾大湿?
【在 C**T 的大作中提到】 : 好。我对网络马工一直都是崇拜有加。没有你们,哪来的这么丰富的信息世界?
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C**T 发帖数: 5379 | 15 这也不能掩盖网络马工的功劳,毕竟这些只是副产品,你说呢?
【在 w********r 的大作中提到】 : 哪来这么些四六不懂, google两下就串用各种概念名词的大虾大湿?
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w********r 发帖数: 14958 | 16 当然有功劳, 打这些伪专家的脸蛋多有乐趣阿。
【在 C**T 的大作中提到】 : 这也不能掩盖网络马工的功劳,毕竟这些只是副产品,你说呢?
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A***n 发帖数: 8859 | 17 连屈服强度都搞不清的人。。。
【在 w********r 的大作中提到】 : 错。 : 有credibility的人,犯错才会影响声誉。 : 早就没credibility的人,哪来的影响一说? : : credibility
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t******k 发帖数: 5617 | |
A***n 发帖数: 8859 | 19 外行typo没关系,充专家大谈特谈便不能typo了
【在 t******k 的大作中提到】 : 这种东西明显是typo啊。。。
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A***n 发帖数: 8859 | 20 同理,不懂什么是屈服强度没关系,左一个定义,右一个定义,最后一个anyway唾面自
干继续充专家扯谈就太扯蛋了。 |
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z*****3 发帖数: 15515 | 21 你说你自己吧?你车上连着保险丝玩刹车玩的怎么样了?
【在 w********r 的大作中提到】 : 错。 : 有credibility的人,犯错才会影响声誉。 : 早就没credibility的人,哪来的影响一说? : : credibility
|
C**T 发帖数: 5379 | 22 如果一个网络专家,一篇不到100字的小文,反复出现HTPP,TCP/LP的“typo”,你信
不?关键词:“反复”。这太不符合专家的定义了
【在 t******k 的大作中提到】 : 这种东西明显是typo啊。。。
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a*******a 发帖数: 4212 | |
w********r 发帖数: 14958 | 24 original, effective, and trustworthy
【在 z*****3 的大作中提到】 : 你说你自己吧?你车上连着保险丝玩刹车玩的怎么样了?
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x*b 发帖数: 5723 | |
t*****g 发帖数: 7455 | 26 包皮
【在 a*******a 的大作中提到】 : 问题是PVC 用在车的哪个部件?
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