IT10,标准公差等级为10级例如,50-80之间的基本尺寸查表可得在IT10级是012mm上下偏差是和公差带有关系的φ60H10孔它的公差等级就是IT10,上下偏差可查表得“H10”的是012~0如果是φ60h10轴则是0~-012可以看出这两个尺寸的公差带都是012,即它是IT10级公差
孔径的精度等级丨T8一T11代表孔加工所要达到的精度必须达到这个要求即孔径的最大值一和最小值即几何尺寸极限值只能在对应范围内,其实还包含孔表面粗糙度等!孔径的精度等级丨T8一T11代表孔加工所要达到的精度必须达到这个要求即孔径的最大值一和最小值即几何尺寸极限值只能在对应范围内,其实还包含孔表面粗糙度等!
1
He saw the grey Land-Rover down the bypass It was more than a hundred yards from him
2
She could, if she wanted, compel him, through a court of law, to support the child after it was born
3
He was through with sports, not because he had to be but because he wanted it that way
他放弃了体育运动,不是因为被迫而是出于自愿。
4
It was nice to see Steve again
5
It has been said that stress causes cancer
6
Of course, as it turned out, three-fourths of the people in the group were psychiatrists
7
It's three o'clock in the morning
8
It was very wet and windy the day I drove over the hill to Mill
9
'Who is it' he called — 'It's your neighbor'
10
It's really the poor countries that don't have an economic base that have the worst environmental records
it的用法 (1)it作无人称代词:it作无人称代词表示自然现象、气候、时间、距离等。it是形式主语没有词汇意义。如: 1)It is very cold today.(气候) 2)It is three o'clock.(时间) 3)It is along way from here.(距离) (2)it作人称代词:it作人称代词时,用来代替上下文中提到的事或物,有时可代替整个句子的内容。 (3)his(was)+形容词十不定式(to do),it为形式主语,不定式短语为真正主语。 (过去分词) (4)his+{形容词}+that(what,how,whether...),it为形式主语,that引导的为主语从句。 (名词) (5)It+不及物谓语动词+that引导的主语从句。这些动词有:seem,appear,turn out,follow,happen等。 (6)It may well be that引导的主语从句。 (7)it作形式宾语: 1)某些及物动词+it+形容词十不定式; 2)某些及物动词+it+形容词+that 在上述两种句型中,it是形式宾语,真正的宾语是不定式短语,或that引导的宾语从句。 (8)it用于强调句型: It is(was)十被强调的成分+that(which,who) 强调句型是简单句,可以用来强调句中主语、宾语和状语,但不能强调定语和谓语。在这种句型中把his...that去掉,句子仍成立。 代词在句中分析与翻译的实例 1.All the various transitions from one form of motion into another are governed by one ofthe fundamental laws of nature,that of the eternity of matter and its motion. 运动可以由一种形式变为另一种形式,所有运动形式的变换都取决于一个基本的自然规律,即物质及其运动永恒性的规律。(that代替one,one代替law。) 2.The author enumerate some of the factors which make it difficult for the sociologist to conduct experiments in the same way as his colleagues in the physical sciences. 作者列举了某些使社会科学家难以进行实验的因素,而在同样的情况下,他的自然科学的同事们却可以进行实验。(it为形式宾语代替真正宾语to conduct...。) 3.The metallurgist has recently found a metal skin for missiles and supersonic planes,one that will retain its strength at the high temperature caused by air friction. 冶金学家最近发明了一种用于导d和超音速飞机的金属外壳,这种外壳在大气摩擦引起的高温下仍然能保持其强度。(one作同位语,代替skin。) 4.If one can scale down all dimensions to,let us say,one tenth,the average lengths of the current-paths will be reduced to one tenth.And the speed of operation will be scaled up 10 times. 如果人们能把所有尺寸缩小,比如说,减小到原来的1/10,那么电流路径的平均长度也将减小到1/10, *** 作速度因而就会按比例提高10倍。(one泛指人。) 5.Underground water reserves are much larger than those on the surface,but as they are unseen we tend to understimate them. 地下水的储量要比地面水大得多,但是由于看不到,所以往往低估了地下水的储量。(those代替reserves。as引导原因状语从句。them代替reserves。) 6.Here we find that the term work has been given by science a somewhat more limited meaning than that to which we have been accustomed. 这里我们发现,科学赋予“功”这个词的含义比我们所习惯的“工作”这个词的含义多少要狭窄一些。(第一个that是连词,引导宾语从句。第二个that是代词,代替work。) 7.We know that air can be compressed, and it is reasonable to suppose that the air at the surface of the earth is compressed by the weight of all the air on top of it. 我们知道空气是可以压缩的,因而我们有理由假设:地球表面的空气受到该空气层上部所有空气重量的压缩。(第一个it是形式主语,代替不定式短语to suppose。句末的it是人称代词,代替“地球表面上的空气”。) 8.It follows from the principle of relativity that Newton’s second law of motion,although fundamental in classical mechanics,only has an approximate and by no means complete validity. 由相对论原理可知,牛顿运动第二定律尽管是古典力学中的基本原理,但只是近似的,而决不是完全正确的。(It follows from...that,“由……可以得出……”。It是形式主语,代替that引出的主语从句。) 9.It was supposed that bodies fall to the ground with a speed which is proportional to their weight。This means that if bodies of 100 pounds and 1 pound are pushed over a cliff,the former falls 100 times as fast as the latter. 曾经有人设想,物体落地的速度与其重量成正比,这就意味着,如果把重100磅的物体和重l磅的物体从悬崖上推下去,前者下落速度是后者的100倍。(the former指bodies of 100 pounds,the latter指bodies of 1 pound。) 10 .Even though the same computer might have performed the same operation millions of times in succession, it must still be told exactly how to do that operation every time it repeats it. 即使同一台计算机很可能已经连续完成同样的运算达数百万次之多,但每当它重复这一运算时都得准确地告诉它如何去完成这一运算。(句中有三个it,第一和第二个it都代替计算机,第三个it代替operation。might have performed是虚拟语气,表示对过去发生事情的猜测。every time是连词,引导时间状语从句。that在句中不是连词,是指示代词,作operation的定语。)
IT表示精度精级,或是公差等级。IT10,表示加工精度为十级。十级的话,相对来说加工精度有点低了。加工精度,标准公差总共有20个等级IT01,0,1,2,3,。。。16,17,18。
十大IT公司排名
如今,不少企业都想拥有属于自己企业或产品的手机APP,但其中最困扰企业主的问题就是:开发一款手机APP到底需要多少钱?
简单点来说,要视手机APP的需求及质量而言,价位一般在几千到十几万左右,更高端的价格更高。
今天,我们就来详细分析一下这个问题,请继续往下看吧。
一、APP开发款式分为固定款和定制款,两者的价格均不相同
固定款:是指直接套用已有的、现成的APP固定模板,报价是固定的,所需要的功能也是固定的,缺点就是客户拿不到源代码,也不能根据企业需求进行定制,由于源代码是封装的,如果企业以后想进行功能升级或系统维护的话,也不能够实现,只能重新开发一个新的软件。
固定款的APP开发时间短,约2~3日的时间即可完成,费用大约在几千到几万之间。
定制款:定制款是指APP的功能全部重新开发,过程比较繁琐,需要美工、策划、APP开发(前台/客户端/手机端)、后台程序员等工种协同完成,大型的、功能复杂的APP甚至需要数十人的团队。
由于APP的功能和设计都是定制的,因此价格会高些。定制款的开发时间与开发价格是成正比的,开发时间长,大约在两三个月甚至不定的周期里才能完成,而费用大概在几万甚至十几万左右。
因此,想要知道开发一款手机APP需要花费多少钱,企业主首先必须把APP的详细需求和功能告知APP开发公司,开发公司才能报出一个合理的价格。
二、手机APP平台不同,制作成本也不一样
现在市面上流行的手机APP制作平台主要有两种一般包括两种系统:安卓系统(Android)和苹果系统(IOS)。
一般来说,制作苹果系统的手机APP软件费用要比安卓平台的贵一些,因为苹果公司对苹果平台的封闭性和手机APP开发语言Objective-C的难度,都让APP开发者加大了苹果系统手机APP开发的难度。
三、APP制作成本包含参与人员的工资
通常情况下,开发一款APP需要产品经理、客户端工程师、后端工程师和UI设计师各一名,这已经是制作手机APP应用软件比较精简的配置了,所以这些参与人员的工资也是包含在APP制作成本当中的。这些工作人员的月薪加起来可能都会超过4、5万元。
四、APP开发公司的所在地
需要注意的是,同样实力的APP开发公司,在不同的城市也会导致APP的成本费用高一些
机械制图公差代码d10是指轴的公差带为d,公差等级为10级。
国标规定分为20个等级,从IT01、IT0、IT1、IT2~IT18, 数字越大,公差等级(加工精度)越低,尺寸允许的变动范围(公差数值)越大,加工难度越小
it有它等意思,那么你知道it的用法吗下面跟着我一起来学习一下,希望对大家的学习有所帮助!
it的用法大全:
it的用法1:用it作人称代词,可替代无生命的东西或事情,在性别不详或无所谓时,也可指代人,尤其是指婴儿。
it的用法2:it作主语时,可指自然现象、季节、时间、距离、环境等。
it的用法3:it可以作先行词,用于强调句型中,强调主语、宾语、时间状语、地点状语、介词宾语或从句等,强调句型中的it一般指已发生过的事,而不指尚未发生或提及的事。
it的用法4:it还常用作形式主语或形式宾语,代替较长的真实主语或真实宾语(其形式多为动词不定式短语或that从句等)。
it的用法5:it可以代替前面提到的某个名词、代词或句子,但在believe, expect, forget, imagine , remember, think等词后常常省略。
it的用法例句:
1 Beauty is an attitude It has nothing to do with age
美是一种态度,与年龄无关。
2 English has hurt me a thousand times, but I still regard it as my first love
英语伤我千百遍,我待英语如初恋。
3 Success is not guaranteed It is not handed to you Success is earned
成功无法保证,并非唾手可得。成功必须靠自己去争取。
4 Success is not final, failure is not fatal: it is the courage to continue that counts--Winston Churchill
成功不是终点,失败也并非末日,最重要的是继续前进的勇气。
5 If you're not satisfied with the life you're living, don't just complain Do something about it
对于现况的不满,不能只是抱怨,要有勇气作出改变。
6 Good luck is when an opportunity comes along and you're prepared for it
好运就是当机会来临时,你早已做好了准备。
7 It's not about making the amazing saves It's the little things and small things that made great gatekeepers great
伟大的门将不是靠神奇的扑救成就,而是靠注重小事和细节成功。(Tim Howard美国国家队门将)
8 Friendship means understanding, not agreement It means forgiveness, not forgettingIt means the memories last, even if contact is lost
友情是理解,不是妥协;是原谅,不是遗忘。即使不联系,感情依然在。
9 Remember, happiness doesn't depend upon who you are or what you have; itdepends solely upon what you think--Dale Carnegie
请记住,幸福不在于你是谁或者你拥有什么,而仅仅取决于你的心态!
10 It was just then that I chanced to look round
就在那时,我恰好环顾了下四周。
11 I know it's nothing serious and I feel quite unemotional about it
我知道那根本没什么大不了的,所以有些无动于衷。
12 The house seemed muted, hushed as if it had been deserted
房子里似乎悄然无声,安静得好像已经没人在住一样。
13 It was the uncommitted that Labour needed to reach
工党需要拉拢的是未表态者。
14 It had once been the home of a wealthy nobleman
这里曾是一个有钱贵族的宅邸。
15 I have $100m hidden away where no one will ever find it
我把1亿美元藏到了一个永远没人会找到的地方。
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