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运动模拟轨迹? 新人报道, 问一运动问题,一直线饶一轴旋转,如何保存、保留,直线旋转的轨迹! 等高人解答,不胜感激!查看更多 0个回答 . 2人已关注
ND钢换热器价格? 目前项目中涉及到一台ND钢 管壳式换热器 ,前期估算整体投资需要知道这台设备的价格,想请教下各位朋友目前ND钢管壳式换热器按照换热面积算每平米大概多少钱?谢谢各位! 祝好!查看更多 1个回答 . 3人已关注
安全阀气密? 大家开车前做气密时,怎么判断 安全阀 漏不漏?查看更多 8个回答 . 3人已关注
丙烯聚合过程中加入氢气为什么? 请不要说改变分子量。我想知道具体的原理,谢谢查看更多 8个回答 . 1人已关注
Aspen物性代号及常用的英语单词中英文对照? Aspen物性代号及常用的英语单词中英文对照,希望对大家有用! 查看更多 9个回答 . 5人已关注
Aspen中IAPWS IF-97怎么选择? 水蒸汽IAPWS IF-97怎么选择,现在软件中只有IAPWS IF-95,客户要求按IAPWS IF-97计算,两个版本差别大么? 查看更多 1个回答 . 5人已关注
汽提塔的安全附件有哪几种? 汽提塔 的安全附件有哪几种?查看更多 10个回答 . 2人已关注
如何划定地锚与桅索的位置? 如何划定地锚与桅索的位置?查看更多 0个回答 . 4人已关注
纠正英语口语表达错误(三)? Example 11: “many”and “much”( 多少 ) 学生经常混有混淆 “many” and “much” 这两个词。 “many” 用来修饰可数名词 , 如 “pieces of chalk, erasers, desks, bowls of salad, dollars, books, people, apples” 等等。而 “much” 是用来修饰不可数名词的 , 如 “chalk, mud, salad, money, knowledge, time, food” 等等。请看下面的例子: Students often confuse the words “many” and “much”. “Many” is used to talk about things that can be counted, such as pieces of chalk, erasers, desks, bowls of salad, dollars, books, people, apples, and things. “Much”, on the other hand, is used to describe things that cannot be counted, such as Chalk, mud, salad, money, knowledge, time, and food. Let` s look at some examples: “There are many people is the gymnasium.” “There is much space in the gymnasium.” “The campus has much buildings.” “The campus has much plant life.” 有时 , 我们也常用更口语化的短语来表达 “many” and “much”, 比如 “a lot of”, 或 “lots of”. 例 : Often, however, we change both “many” and “much” to a more colloquial phrase, such as“a lot of”, or “lots of”. For example: “I can learn a lot of knowledge from my teachers.” (“A lot of” here replaces “much”. “A lot of” 在句子里相当于 “much”.) “I saw lots of horses in Inner Mongolia.” (“Lots of” here replaces “many”. “Lots of” 在这里相当于 many.) 然而 , 在固定词组 “how much” 和 “how many” 中 , 我们不能用其他任何词来带替 “many” 和 “much” 。例: However, in the set phrases “how much” and “how many” we cannot replace “many” and “much” with other words. For example: “How much does this stuffed animal cost?” “It costs a lot of money.” “How much food did you make for dinner?” “I made lots of food. I made pizza, baked chicken, and some banana bread.” “How many desks are there in the classroom?” There are lots. I can count forty-eight.” “How many people are there in the country of Indonesia?” “I` m not sure, but I know there are lots.” - or- “I` m not sure, but I know there are many.” Example 12: 我曾 ……/ 不曾 …… A: “Have you ever been to South America?” Incorrect English: B: “Yes, I have ever been there.” Correct English: B: “Yes, I have been there.” A: “Have you ever sung a Beatles song in front of a crowd of people?” Incorrect English: B: “Yes, I have ever sung a Beatles song in front of a crowd of people.” Correct English: B: “yes, I have sung a Beatles song in front of a of people.” 解释 :  上述A提出的问题是正确的,当我们询问某人是否曾经有过别的经历时,我们用 “ever” ,但是 “Incorrect English” 中 B 的回答显然是错误的。当回答我们确实有过某种经历时,不用 “ever” ;而回答没有某种经历时,我们或者用 “never” ,或者用带有 “ever” 的否定句。请看: Explanation : The above questions spoken by A are correct .when we are asking someone if they have had a particular experience , we use the word “ever”. But the responses given by B under “incorrect English” are indeed incorrect .When we are stating that we have indeed had the experience of doing something , we do not use the word “ever”. If we are stating that we have not had a particular experience , we either use the word “never”or a negative sentence with the word “ever”. Let’s look at some examples : A : “Have you ever been to the Museum of Modern Art in San Francisco ? ” B : “Yes , I have been there . In fact , I just went last Thursday.” -or-B : “No , I have never been there .The entrance fee is too expensive.” -or-B : “No , I haven` t ever been there. I` m looking forward to going sometime , though.” A : “Have you ever seen the film “pretty Woman” ? ” B : “Yes , I’ve seen it . it made me cry.” -or-B : “No , I’ve never seen it .I don’t really think Richard Gere is a very good actor.” -or-B : “No , I haven` t ever seen it .perhaps someday I will rent the videotape.” A : “Has your mother ever come to see you here in Paris ? ” B : “Yes , she came time twice last winter.” -or-B : “Yes , she has come about six or seven times.” -or-B : “No , she has never come to see me.” -or-B : “No , she hasn’t ever come to see me . She Promised she will come next spring. She really wants to see Eiffel Tower.” Example 13: “to make” 和 “to let” (使/让) 学生们经常混淆 “to make” 和 “to let” 的用法.这里让我们先弄清它们的区别之一,以便正确地使用.下面的两个例子十分相象,我们要找出它们的区别所在。 Students often confuse the verbs“to make”and “to let”. Here we clear up one of the many problems in distinguishing these two words and using them correctly. Let’s look at two nearly identical sentences , and see where the distinction lies. “When Brian was little , his parents made him wash the dishes every night after dinner.” “When Lisa was little , her parents let her wash the dishes every night after dinner.” 这两个句子有何不同呢?在第一句中, “made” 相当于 “forced” ,也就是说 Brian 并不是真心实意地想洗碗,但是他的父母吩咐他去洗,或许是教会他懂得劳动的价值。在第二句中, “let” 相当于 “permitted” 或 “allowed” , 也就是说, Lisa 很乐意洗碗,而她的父母并不阻止她,也许 Lisa 是个懂事的孩子,愿为父母分担家务。 再看其他几个例子: “How are these two sentences different ? In the first sentence , "made" means "forced".In other words , Brian did not really want to do the dishes , but his parents forced him to wash them , perhaps to teach him the value of labor. In the second sentence , "let" means "permitted" or "allowed". In other words , Lisa wanted to do the dishes , and her parents did not stop her, but instead allowed her to do the dishes. Lisa perhaps was a good-natured child looking to assist her parents. Let’s look at some other examples : ”My boss made me work all day without a break. I’m exhausted. “ (I didn’t really want to work all day; I had to. 工作了一天 , 真不请愿 , 可又不得不 ) ”my boss let me leave work early today because we worked so hard yesterday. “ (I was happy to get off work early . 提前下班对我来说很开心 ) ”The officers in the military often make the soldiers do hard labor and tough training. The officers also don’t let the soldiers go out at night. “ ”The elementary school teacher made the students stay after school because they were naughty. “ "We really like our new math instructor because she lets us eat the classroom." Example 14: “to have” 和 “to be ”(“ 存在 ” 或 “ 有 ”) 英语表达 “ 存在 ” ( 既汉语 “ 有没有 ” 的 “ 有 ”) 的概念有两种方法 , 既 “to have” 和 “to be ”, 学生们经常混淆这两个词 , 不能正确使用。 Because there are two basic ways of expressing existence in English, or expressing the Chinese word “ 有 ”,students often mix them up and incorrectly use them together .The two ways of expressing “you” are the verbs “to have” and “to be ”. Incorrect English: “In Harbin every year there has an Ice-Lantern Festival. ” Correct English: “In Harbin every year there is an Ice-Lantern Festival.” -or- “Every year Harbin has an Ice-Lantern Festival.” Incorrect English: “In Italy there has a beautiful coastline.” Correct English: “In Italy there is a beautiful coastline.” -or- “Italy has a beautiful coastline.” 解释 : 在上面错误的范例中 , 所话者错误地使用了 “to have” 和 “to be ” 句型。在改正后的句子中,第一句使用了 “to be” 句型,第二句使用了 “to have” 句型。请看更多的例句: Explanation : In the incorrect English sentences above , the speaker is mistakenly using parts of both the“to have”and the“to be”pattern 。 In the corrected sentences , the first sentences use the“to be”pattern and the second sentences use the“to have”pattern. Let’s look at more examples: “Lots of people are in the yard enjoying the sun.” “The yard has a lot of people in it enjoying the sun.” “There is a CD on the desk.” “The desk has a CD on it .” “There is a stain on my pants.” “My pants have a stain on them.” “There is a beautiful advertisement for shampoo on that huge building.” “That huge building has a beautiful advertisement for shampoo on it.” “My kitchen has a strange smell right now. I guess there are some rotting vegetables in it.” “There is a strange smell in my kitchen right now . I guess it has some rotting vegetables in it.” Example 15: 与 …… 相同 (“same as”/ “same to”) 在对比句型中 , 学生们也常出错 , 这必须加以重视并予以改正。 Students often make mistakes in sentences of comparison. Here we consider and correct one such mistake. Incorrect English: “He is the same grade to me ; we are both freshman.” Correct English: “He is the same grade as me; we are both freshman.” 上面病句的问题在于使用了 “to”, 而不是 “as” 。请看其他句子 : The problem in the above incorrect sentence is the use of the preposition “to”instead of the preposition“as”.Let’s look at more examples: Incorrect English: “That textbook is the same to this book ; they are both about civil engineering.” Correct English: “That textbook is the same as this book ; they are both about civil engineering.” Incorrect English: “Chris is the same height to me.” Correct English: “Chris is the same height as me.” “This red shirt is the same size as that striped shirt. ” “Larry has the same personality as I have ; we both get angry very easily.” 在上面有比较句子中我用 “same as”, 而不是 “same to” 。然而 , 有时我们也必须使用 “same to”. 如 : In all of the above sentences ,normal comparison sentences ,we use “same as ”rather than “same to ”.However, there are also occasions in which we should use “same to ”. For example: A: “Should we go watch a movie or go to a concert? ” B: “I don’ t care . It’ s the same to me either way .There’ s no difference. It doesn’t matter. ” 查看更多 0个回答 . 4人已关注
GB 50229-2006 火力发电厂与变电站设计防火规范? GB 50229-2006 火力发电厂与变电站设计防火规范查看更多 4个回答 . 4人已关注
关于氯甲烷钢瓶使用? 如题,氯 甲烷 钢瓶使用过程中能否1个口出液体,1个口往里加氯甲烷气体加压,这种情况算不算充装。 查看更多 1个回答 . 1人已关注
煤直接液化相关资料汇总? 回复 12# fate 太好了,正需要,谢谢了。楼主查看更多 22个回答 . 2人已关注
关于无火花型防爆,向大家请教。? 现场为防爆区域 ; 现 开关阀 ( 非金属 隔膜阀 ) 的阀门位置反馈采用 EXnA IIB T4( 即无火花型防爆 )的 位置开关 ,有 无火花型的防爆认证证书 ; 位置开关安装在塑料的开关盒内 , 通过转接端子将位置开关的尾线和现场电缆进行连接 ; 开关盒只有 IP 等级 , 没有防爆等级 1、 因位置开关已达到防爆要求,安装开关的开关盒是否需要达到防爆要求? 2、 位置开关在与现场电缆连接的中间接线端子有无具体的要求? 3、 这样是否符合设计规范要求? 4、 这样是否符合防爆验收规范要求? 简单的说就是只有阀位开关采用了无火花型防爆形式,其相应的保护及其他配件不采用防爆形式, 因阀位开关整体中只有开关本体是 电子元件 ,其余均为机械部件或感应部件;阀位开关整体是否符合防爆设计、使用及验收要求? 查看更多 2个回答 . 2人已关注
GB/T 4728.7-2008 电气简图用图形符号 第7部分:开关、 ...? GB/T 4728.7-2008 电气简图用图形符号 第7部分:开关、控制和保护器件查看更多 0个回答 . 2人已关注
最新的PVC分析方法? “微谱分析”是指利用微观谱图对未知成分进行分析的技术方法。相比较全部成分和有效成分而言,主成分的定性与定量分析,操作起来更加简便易行,而且应用范围也相对更广泛一些。通常对于 PE 、 PP 、 PS 、 ABS 及 工程塑料 、特种塑料等来说,微谱采用红外光谱仪( IR )、核磁共振仪 (NMR) 等技术手段,并综合利用微观谱图数据做对比,可初步分析出该塑料的主体树脂成分。 塑料有很多种类型,从其基本特性来看,有丙烯酸、环氧、聚氨酯、聚乙烯、聚丙烯、 聚氯乙烯 、聚苯乙烯、聚甲醛,聚碳酸酪,聚酰胺等等。为了弄清它属于哪一种树脂体系,需要采用先进的分析技术手段来对其进行成分检测。通常从分析结果来看,其主体树脂的名称、特性、含量比例,则明确了说明了该塑料的类型、性能、功效及用途方向。而这正是微谱分析综合利用各种仪器所得出的微观谱图所达到的真正目的。 用微观谱图对未知成分进行分析的技术方法。对 塑料制品 、塑料粒子或助剂做成分鉴定,通常是想验证含有多种成分的样品中、是否含有某种已知化学物质或有效成分的;还有一种可能是,比如对于某种塑料助剂,已经确定样品中含有一种邻苯类物质,想进一步确定其具体含量。 这时可采用 FTIR , SEM-EDS , GC-MS , XRD 等仪器分析手段,并结合微观谱图数据库,来对某种塑料成分进行鉴定。 查看更多 0个回答 . 2人已关注
绕管式换热器的图片? 请教各位前辈,有谁知道绕 管式换热器 的图,教教我吧查看更多 6个回答 . 1人已关注
甲醇及其下游产物的发展趋势? 在经过将近两年的爆发式的 甲醇 不等规模的建设后,市场逐渐冷清了下来,据统计目前国内的甲醇厂有一半以上都在停车状态,甲醇的发展暂时告一段落,那么今后下游产品会是怎么样的发展,大家共同探讨一下查看更多 4个回答 . 3人已关注
四旋底部废剂罐泄剂的问题? 向大废剂罐泄剂时管线经常堵,请问各位师傅如何预防和处理!查看更多 4个回答 . 1人已关注
泵壳上什么情况设有排气口? 一般悬臂泵或者双支撑的泵的泵壳上都有排气口吗? 作用是什么,仅仅在开工用吗? 这些口需要接管线吗? 查看更多 5个回答 . 2人已关注
硫磺装置液态硫磺用什么测量? 最近我公司要上一套 硫磺 回收装置,其中有一台表测量液态硫磺,设计院设计的用射频 料位计 ,我认为不好,打算改为雷达,可我不知道选用接触式的还是非接触式的,哪种好呢?因为我害怕硫磺结晶影响测量,欢迎大家讨论。查看更多 15个回答 . 1人已关注
简介
职业:福建未来药业有限公司 - 仪表管理
学校:华中师范大学 - 化学学院
地区:甘肃省
个人简介:即使曾经通宵达旦地聊过无数次,现在我们还是晚睡,也心照不宣地再没联络过。查看更多
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