苯有哪些同系物

温度 = 345K；

压力 = 0.1Mpa

密度 = 817.8 kg/m3；

Cp= 1.86 KJ/(KgK)

导热系数 = 0.117 W/(mK)；

粘度 = 0.34 mPas

有人说，我们的地球应当叫水球。这是有一定道理的，因为我们生活的这个星球有水，而且71%的表面积被水占着。在宇航员看来，地球是一个蓝色的球，十分璀灿，太阳系家庭中独一无二。地球拥有的水量非常巨大，总量为13.86亿立方千米。其中，96.5%在海洋里；1.76%在冰川、冻土、雪盖中，是固体状态；1.7%在地下；余下的，分散在湖泊、江河、大气和生物体中。因此可以说，从天空到地下，从陆地到海洋，到处都是水的世界。

惊天动地的水循环 ，全世界的水是一个有联系的整体。海水在阳光的照射下，不断蒸发，水汽弥漫在海洋上空；一部分水汽被气流带到陆地上空，遇冷就凝结成细小的水滴，变成云，降落到地面就是雨或雪；雨雪水落地后，有的流到洼坑里，有的渗入地下，有的流入小沟，汇进江河，奔向海洋。无数小水滴就是这样一刻不停地在世界上旅游。水循环保证了人类淡水的供应。知道水的循环以后，你就能解释：云的故乡在哪里？为什么江河里日日夜夜总是川流不息？为什么千万年来那么多江河水流进海洋，而海洋不见满溢出来？

淡水在哪能里 地球上的水，尽管数量巨大，而能直接被人们生产和生活利用的，却少得可怜。首先，海水又咸又苦，不能饮用，不能浇地，也难以用于工业。其次，淡水只占总水量的2.6%左右，其中的绝大部分（占99%），被冻结在远离人类的南北两级和冻土中，无法利用，只有不到1%的淡水，它们散布在湖泊里、江河中和地底下。与全世界总水体比较起来，淡水量真如九牛一毛。

Our water polo

Someone said, our earth should call water polo. This is a reason, because of our lives, and our planet is water surface area by water 71% takes. The astronauts opinion, the earth is a blue ball, very resplendent in the family, the solar system is unique. Earth has very great volume of water, total 13.86 billion cubic kilometers. Among them, 96.5% in the sea, The frozen earth, snow in glaciers, cover, is a solid state1.7% in underground, The remaining, scattered in the lakes, rivers, atmosphere and organisms. Therefore we can say that from the sky to the ground, from land to sea, the water is all over the world.

Earthshaking, the world's water circulation water is a contact of the whole. Seawater in sunshine, constantly evaporation, steamy over the sea, Part of water vapor was brought to land, air over they get cooler condenses into small droplets into clouds, fell to the ground is rain or snow, After landing, some rain water flow to the hollow pits, some infiltration underground, some into small groove, remit into rivers and rush to the ocean. Countless droplets that keeps momently ground in the world tour. Water cycle guarantee human freshwater supplies. Know the water cycle later, you can explain: cloud hometown in where? Why always flowing rivers days and nights? Why so many thousands of rivers flow into the sea, and Marine missing overflow?

Freshwater where can the water on the earth, although there are tremendous, and can directly by people living and production to use, but a little. First, seawater and salty again bitterness and not drinkable, cannot irrigate fields, it will be difficult for industrial. Secondly, freshwater accounts for only total water 2.6 or so, most of them (99%), frozen in the north and south of stay away from the humans two level and permafrost, cannot use, less than 1% of fresh water, they spread in lakes, rivers and underground. With the world total water comparison, freshwater really like a snip.

2、VOCS（挥发性有机物）

室内空气中的VOCS主要来源于各种建筑和装饰材料，如油漆、涂料、粘胶剂、室内装饰用品、空气消毒剂、杀虫剂等化工产品释放、燃料燃烧、烹饪、环境烟草烟雾，日用化学品等。VOCS对人的各种粘膜刺激作用中最常见的是对眼、鼻、咽喉部位的刺激，引起眼睛刺痛和干燥感，眨眼频率增加，并常伴有无其他症状的流泪，眼分泌物增多。使泪膜的稳定性降低，泪液中细胞含量发生变化如白蛋白浓度增加，出现鼻咽部干燥、刺痛、鼻血、鼻塞并可出现咳嗽、声音嘶哑和嗅觉改变等。咽部检查可见咽喉充血、炎症。皮肤多见干燥、瘙痒、刺痛、红斑等。VOCS污染严重时可致神经精神机能失调及痴呆。许多VOCS还可导致过敏性肺炎。

2, volatile organic compounds (VOCS)

Indoor air of VOCS mainly comes from various types of construction and decoration materials, such as paint, coating, adhesive, indoor decorative supplies, air disinfectants, pesticides and chemical product release and fuel burning, cooking, environmental tobacco smoke, daily chemical, etc. To the person's various mucosa VOCS stimulation is the most common is irritating to eyes, nose, and throat chakra stimulation, cause eye tingling and dry feeling, blinking frequency increases, and frequent, no other symptoms of tears, eye secretion increased. Make the LeiMo reduced stability, tear cells content changes such as albumin increasing concentration, appear nose pharynx ministry dry, tingling, nosebleed, and snuffle and can appear cough, 3 hoarseness and smell change etc. Pharyngeal checks visible throat hyperaemia, inflammation. See more dry, itchy skin, smartly, erythema, etc. VOCS pollution serious when can cause nerve mental dysfunction and dementia. Many VOCS can also cause hypersensitivity pneumonitis.

3、苯系物

苯系物是VOCS中研究较多的一类化合物，室内常见的苯系物包括苯、甲苯、乙苯、二甲苯等，主要来自涂料、粘合剂、地板、家具，也有部分来自石油及其燃烧产物。国际癌症研究机构（LARC）已确认苯为人类致癌物，接触高浓度的苯（127.6mg/m3）有发生急性非淋巴细胞性白血病的危险；急性高浓度苯暴露还可引起中枢神经抑制和发育不全性白血病。甲苯、二甲苯、乙苯在一定浓度时可对眼和上呼吸道粘膜产生刺激，并可引起疲劳、乏力、头痛、意识迷糊和中枢神经抑制；在高浓度时，可引起脑病和脑萎缩，导致共济失调。甲苯的急性毒性为神经毒性和肝毒性，二甲苯可产生急性肾毒性，神经毒性和胚胎毒性。

3, benzene department content

Benzenes in VOCS content is more research in class of compounds, indoor common benzenes in content including benzene, toluene, xylene, ethylbenzene etc, mainly from coating, adhesive, floor, furniture, some from oil and combustion products. The international agency for research on cancer (LARC) has confirmed benzene for human carcinogens, contact with high concentrations of benzene (127.6 mg/m3) have an acute blame drenchs ba leukemia dangerousAcute high concentrations of benzene exposure can also cause central nervous suppression and dysplasia sex leukemia. Toluene, xylene, ethylbenzene in certain chroma can be irritating to eyes and upper respiratory tract mucous membrane produces stimulation, and can cause fatigue, weakness, headache, consciousness confused and central nervous inhibitionIn high concentration, can cause brain atrophy, causing encephalopathy and ataxia. Toluene acute toxicity for neurotoxicity and liver toxicity, xylene can produce acute renal toxicity, neurotoxicity and embryology toxicity.

4、NH3（氨）

室内空气中的氨也可来自室内装饰材料，如建筑主体结构上加入的防冻剂，胶粘剂，烫发剂，人体分泌物及代谢物等。氨对人体的眼和呼吸道粘膜有刺激作用，低浓度时主要是刺激症状，眼痒、眼干、打喷嚏、咽喉干燥、流鼻涕等，高浓度时可产生炎症。氨的溶解度极高，所以主要对人体的上呼吸道有刺激和腐蚀的作用，减弱人体对疾病的抵抗力，对于呼吸系统有病的人要更加注意。短期内吸入大量氨气后可出现流泪、咽痛、声音嘶哑、咳嗽、痰可带血丝、胸闷、呼吸困难，可伴有头晕、头痛、恶心、呕吐、乏力等。严重者可发生肺水肿、成人呼吸窘迫综合症。

4, NH3 (ammonia)

Indoor air of ammonia can also come from indoor decoration materials, such as the construction of subject structure in joining antifreeze, adhesives, marcel agent, the human body secretions and metabolites, etc. Ammonia to human eyes and respiratory tract is irritant, low concentration is mainly stimulating symptoms, eye itch, dry eye, sneeze, throat drying, runny nose, high concentration can produce inflammation. Ammonia is extremely high, so the solubility of mainly for human upper respiratory tract have stimulated and corrosion function, abate the human body resistance to illness, for respiratory sick person wants to pay attention. Short-term inhaled large ammonia after can appear tears, sore throat, voice hoarse, cough, phlegm can take silk, bosom frowsty, difficulty breathing, may be accompanied by dizziness, headache, nausea, vomiting, fatigue, etc. Serious can produce pulmonary edema, adult respiratory distress syndrome.

5、臭氧（O3）

室内O3主要源于复印机等办公设备及室外。O3的强氧化力对人体健康有危害作用。人群短期O3暴露后可出现肺功能水平急速降低。O3的嗅阈为40μ g/m3，在100μ g/m3以下时，被认为是无作用剂量浓度。达200μ g/m3时，可对易感者的眼、鼻及咽部粘膜产生刺激；当浓度达300μ g/m3时，将近30%的人群有粘膜刺激感；15%的人群一秒钟最大呼气流量下降；达400μ g/m3时，50%的人群产生刺激症状，25%的人群一秒钟最大呼气流量下降。O3浓度在4.28mg/m3（2ppm）时，短时间接触即可出现呼吸道刺激症状、咳嗽、头痛，在此浓度下暴露2小时可出现呼吸困难、胸痛。低浓度O3长期作用可抑制人体免疫机能。

5, ozone (O3)

Indoor O3 mainly comes from copiers.the equipment and outdoor. O3 of strong oxidation force is harmful to human body health role. Crowd short-term O3 after exposure can appear sharply reduced lung function level. The smell of the threshold for 40 O3 muon g/m3, in 100 muon g/m3 below, is considered to be without effect dose concentration. 200 mu g/m3 can be susceptible persons of eye, nose and throat mucous membrane produces stimulation, When the concentration of 300 mu g/m3, nearly 30 percent of people who have mucosal excitement, A second largest 15% of the crowd expiratory flow downUp to 400 mu g/m3, 50% of the crowd stimulates the production of symptoms, 25% of the crowd a second largest expiratory flow decline. O3 concentration in 2ppm m3 (4.28 mg /), shorter contact can appear respiratory symptoms of irritation, headache, cough, in this concentration by exposing 2 hours can have difficulty breathing, chest pain. Low concentration O3 long-term effects can restrain the body's immune function.

6、硫化氢（H2S）

室内H2S污染主要来源于下水道、生活垃圾、污物等，另外，人体呼出气、汗液、大小便等也可排出H2S。H2S是无色有臭鸡蛋味的气体，对中枢神经系统，上呼吸道系统有较强的刺激，易引起中毒。低浓度H2S中毒症状为头痛、头晕、恶心、呕吐；高浓度H2S中毒症状为昏迷、意识突然丧失、窒息死亡。

室内空气二次污染主要由使用空调调节系统引起。空调对人体健康的危害可分为三大类：急性传染病，过敏性疾病（肺炎和哮喘）和不良建筑综合症。空调环境下工作和生活的人容易出现疲乏、头疼、胸闷、恶心、嗜睡、易感冒等症状，即所谓的“空调综合症”。

6, hydrogen sulfide (H2S)

Indoor H2S pollution mainly come from the sewer, living garbage, dirt, etc, in addition, human breath, sweat and urine to wait to also can discharge H2S. H2S is colorless bad egg flavor of gas, the central nervous system, the upper respiratory system has the strong stimulation, easy cause poisoning. Low concentration H2S poisoning symptoms for headache, dizziness, nausea, vomiting, High concentrations of H2S poisoning symptoms for coma, consciousness suddenly loses, suffocation deaths.

Indoor air secondary pollution mainly by using air conditioning control system is caused. Air conditioning damage to human body health can be divided into three categories: acute infectious diseases, allergic diseases (pneumonia and asthma) and bad building syndrome. Air conditioning environment to live and work appears easily fatigue, headache, chest tightness, nausea, drowsiness, easy to catch a cold, the so-called "air conditioning syndrome".

生活饮用水水质常规检验项目

生活饮用水水质常规检验项目及限值见表1。

表1 生活饮用水水质常规检验项目及限值 项 目 限 值

感官性状和一般化学指标

色……………….....色度不超过15度，并不得呈现其它异色

浑浊度……………. 不超过l度(NTU)①，特殊情况下不超过5度(NTU)

臭和味……………… 不得有异臭、异味

肉眼可见物………… 不得含有

pH …………………..6.5—8.5

总硬度(以CaCO3计)… 450(mg／L)

铝 …………………..0.2(mg／L)

铁 …………………. 0.3(mg／L)

锰………………….. 0.1(mg／L)

铜 ……………………1.0(mg／L)

锌…………………….1.0(mg／L)

挥发酚类(以苯酚计).. 0.002(mg／L)

阴离子合成洗涤剂… 0.3(mg／L)

硫酸盐………………. 250(mg／L)

氯化物 ………………250(mg／L)

溶解性总固体…….. 1000(mg／L)

耗氧量(以O2计)…….. 3(mg／L)，特殊情况下不超过5mg／L②

毒理学指标

砷 …………………… 0.05(mg／L)

镉…………………….. 0.005(nlg／L)

铬(六价)……………… 0.05(mg／L)

氰化物…………………. 0.05(mg／L)

氟化物……………….. 1.0(mg／L)

铅…………………….. 0.01(mg／L)

汞 ………………….. 0.001(mg／L)

硝酸盐(以N计)………. 20(mg／L)

硒……………………. 0.01(mg／L)

四氯化碳……………. 0.002(mg／L)

氯仿……………………. 0.06(mg／L)

细菌学指标

细菌总数………………. 100(CFU/mL)③

总大肠菌群 …………...每100mL水样中不得检出

粪大肠菌群…………….. 每100mL水样中不得检出

游离余氯……………… 在与水接触30分钟后应不低于0.3mg／L，管网末梢水不应低于0.05mg／L(适用于加氯消毒)

放射性指标④

总α放射性………….. 0.5(Bq/L)

总β放射性…………….. 1(Bq／L)

注：①表中NTU为散射浊度单位。②特殊情况包括水源限制等情况。③CFU为菌落形成单位。④放射性指标规定数值不是限值，而是参考水平。放射性指标超过表1中所规定的数值时，必须进行核素分析和评价，以决定能否饮用。

.2.2 生活饮用水水质非常规检验项目

生活饮用水水质非常规检验项目及限值见表2。

表2 生活饮用水水质非常规检验项目及限值 项 目 限 值

感官性状和一般化学指标

硫化物………………… 0.02(mg／L)

钠 ………………………200(mg／L)

毒理学指标

锑…………………….. 0.005(mg／L)

钡 ………………………0.7(mg／L)

铍…………………….. 0.002(mg／L)

硼………………………. 0.5(mg／L)

钼………………………. 0.07(mg／L)

镍………………………… 0.02(mg／L)

银………………………… 0.05(mg／L)

铊……………………….. 0.0001(mg／L)

二氯甲烷…………………….. 0.02(mg／L)

1，2-二氧乙烷 …………..0.03(mg／L)

1，1，1-三氯乙烷………… 2(mg／L)

氯乙烯…………………… 0.005(mg／L)

1，1-二氯乙烯…………. 0.03(mg／L)

1，2-二氯乙烯……….. 0.05(mg／L)

三氯乙烯………………. 0.07(mg／L)

四氯乙烯………………. 0.04(mg／L)

苯 ………………………0.01(mg／L)

甲苯 …………………..0.7(mg／L)

二甲苯……………….. 0.5(mg／L)

乙苯………………….. 0.3(mg／L)

苯乙烯…………………. 0.02(mg／L)

苯并（a）芘………….. 0.00001(mg／L)

氯苯……………………. 0.3(mg／L)

1，2-二氯苯………….. 1(mg／L)

1，4-二氯苯 ………………….0.3(mg／L)

三氯苯（总量） …….……...0.02(mg／L)

邻苯二甲酸二（2-乙基已基）酯 0.008(mg／L)

丙烯酰胺…………………….. 0.0005(mg／L)

六氯丁二烯 ……………………0.0006(mg／L)

微囊藻毒素-LR………………… 0.001(mg／L)

甲草胺 …………………………0.02(mg／L)

灭草松…………………………. 0.3(mg／L)

叶枯唑………………………… 0.5(mg／L)

百菌清………………………….. 0.01(mg／L)

滴滴涕…………………………… 0.001(mg／L)

溴氰菊酯…………………………. 0.02(mg／L)

内吸磷………………………….. 0.03(mg／L)(感官限值)

乐果…………………………….. 0.08(mg／L)(感官限值)

2，4—滴……………………….. 0.03(mg／L)

七氯…………………………… 0.0004(mg／L)

七氯环氧化物…………………….. 0.0002(mg/L)

六氯苯…………………………. 0.001(mg/L)

六六六 ………………………….0.005(mg／L)

林丹……………………………… 0.002(mg/L)

马拉硫磷……………………….. 0.25(mg/L)(感官限值)

对硫磷 ………………………….0.003(mg／L)(感官限值)

甲基对硫磷…………………….. 0.02(mg／L)(感官限值)

五氯酚…………………………. 0.009(mg／L)

亚氯酸盐………………………. 0.2(mg／L)(适用于二氧化氯消毒)

一氯胺…………………………… 3 (mg／L)

2，4，6 三氯酚……………… 0.2(mg／L)

甲醛 ……………………….. 0.9(mg／L)

三卤甲烷① …………………..该类化合物中每种化合物的实测浓度与其各自限值的比值之和不得超过1

溴仿…………………………….. 0.1(mg／L)

二溴一氯甲烷 …………………. 0.1(mg／L)

一溴二氯甲烷………………….. 0.06(mg／L)

二氯乙酸 ……………………..0.05(mg/L)

三氯乙酸………………………… 0.1(mg／L)

三氯乙醛(水合氯醛)……………… 0.01(mg／L)

氯化氰(以CN—计)…………….. 0.07(mg／L)

硅甲烷的中心源自是硅原子，硅原子本身就大，形成的共价键中电子云重叠较少，共价键不如甲烷稳定，导致稳定性下降

2.(4种 )在C原子数不超过10的烷烃分子中，其一卤代烃不存在同分异构体的烷烃共有____。

A.2种

B.3种

C.4种

D.5种

这个题很简单，首先甲烷和乙烷可以，之后把甲烷的四个氢换成甲基，是新戊烷，乙烷的六个氢换成甲基也可以，就看思维的灵活性了

3.( )甲苯苯环上的一个H原子被-C3H7取代，得到的一元取代物有___六种_。

A.3种

B.4种

C.5种

D.6种

首先由邻间对三种异构体而丙级有两种形式，一是一号碳上的氢脱掉，还有就是二号碳上的请脱掉，共有2*3=六种取代物

4.( )下列化合物中，苯环上的H原子被Br原子取代，所的的一溴代物有三种同分异构体的是__邻二甲苯__。

A.乙苯苯环上有邻间对三种，支链上有两种，共五种

B.邻二甲苯 这个有在苯环上有连偏两种，支链上有一种共三种

C.间二甲苯 这个在苯环有连偏均三种支链上有一种共四种

D.对二甲苯 苯环上只有偏一种，支链上有一种，共两种

5.C8H10中喊含有苯环，则苯环上的一硝取代物有____种。

肯定是二甲苯

如果是乙苯，有邻间对三种

如果是邻二甲苯有连偏两种

如果是间二甲苯有连偏均三种

如果是对二甲苯，只有偏一种

以上邻间对连偏均都是邻位间位对位……的简称

nail怎么读语音: 英音[neɪl] 美音[nel] 。

nail 基本解释：

n. 钉子；指甲，趾甲；钉状物；纳尔

vt. 钉住；抓住；使固定；揭露

nail 变化形式：

复数： nails

第三人称单数： nails

过去式： nailed

过去分词： nailed

现在分词： nailing

nail 用法和例句：

Nail polish contains toxic products like toluene , phenol and xylene .

指甲油中含有有毒物质如甲苯，苯酚，二甲苯。

This nail will not hold such a heavy mirror .

这个钉子支撑不住这样重的镜子。

Will re-apply the screws and nail gun .

此处还要用到螺丝钉和钉枪。

Look -- obama nail polish !

看啊--奥巴马指甲油！

Should you let your three-year-old wear her child-friendly nail polish to preschool ?

你应该让你三岁的女儿涂上儿童无害的指甲油去幼儿园吗？