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专题五轴改错题与总结

专题五轴改错题与总结
专题五轴改错题与总结

专题五轴结构常见错误总结

㈠、轴本身的常见结构错误:

⑴、必须把不同的加工表面区别开来,精加工面不能过长;

⑵、轴段的长度必须小于轮毂的长度;

⑶、必须考虑轴上零件的轴向、周向固定问题;

⑷、轴外伸处应考虑密圭寸问题;

(5)、轴端与端盖不能接触(转动件与静止件不能接触)。㈡、轴承安装的常见错误:

⑴、角接触球轴承和圆锥滚子轴承

①、一定要成对使用;

②、方向必须正确,必须正装或反装(若正装,轴承游隙靠调整垫片调整;若反装,轴承游隙靠圆螺母调整);

③、外圈定位(固定)边一定是宽边。

⑵、轴承内外圈的定位必须注意内外圈的直径尺寸问题

①、内圈的外径一定要大于固定结构的直径;

②、外圈的内径一定要小于固定结构的直径。

⑶、轴上如有轴向力时,必须使用能承受轴向力的轴承(角接触球轴

承或圆锥滚子轴承)⑷、轴承必须考虑密封问题轴承为脂润滑时,两端的轴承内侧要有圭油盘(档油环)当齿轮齿顶圆小于轴承外圈外径时,两轴承与齿轮之间应加挡油盘,防止从齿轮上甩出的含有杂质的润滑油贱入轴承,影

轴承寿命

⑸、轴承必须考虑轴向游隙调整问题。

㈢、键槽的常见错误:

⑴、同一轴上所有键槽应在同一条母线上;

⑵、键槽的长度必须小于轴段的长度;

⑶、半圆键不用于传动零件与轴的连接。

㈣、轴承端盖的常见错误

⑴、对于角接触和圆锥滚子轴承,轴承端盖一定要顶在轴承的大端;

⑵、和机体的联接处必须要考虑轴承的间隙调整问题;

⑶、轴承端盖为透盖时,必须和轴有间隙(转动件与静止件不能接触),同时,必须考虑密封问题;

(4) 、轴承端盖的加工面与非加工面应以区分;

(5) 、箱体与轴承端盖的连接面加工面与非加工面应分开,便于装配。㈤、联轴器的常见错误

(1) 、联轴器没有轴向或轴向定位;

(2) 、联轴器不能与轴承端盖接触 (转动件与静止件不能接触) ;

(3) 、联轴器孔必须打通,否则联轴器无法安装;

(4) 、无沉孔的联轴器不能用压板螺钉做轴向定位。

㈥、螺纹的常见错误

⑴、轴上螺纹应有螺纹退刀槽;

⑵、紧定螺钉应该拧入轴上被联接零件,端部应顶在轴上;

⑶、螺纹联接应保证安装尺寸;

⑷、避免螺纹联接件承受附加弯矩,螺纹支承面上应加工出凸台或鱼眼坑。

习题:

一、找出轴系的错误并分析错误原因,用序号标出,并在下面画出正确的轴系图。

1 2 3 10 5 6 J1 7 8 4 129 11 6 5

1

二、找出轴系的错误并分析错误原因,用序号标出,并在下面画出正确的轴系图。

J + 12 6 7 1

三、找出轴系的错误并分析错误原因,用序号标出,并在下面画出正确的轴系图。

I 1 R A7 E F ft 7

四、找出轴系的错误并分析错误原因,用序号标出,并在下面画出正确的轴系图。

五、试指图中的轴系零部件结构中的错误,并说明错误原因。(说明:轴承部件采用两端固定式支承,轴承采用油脂润滑)

应用文改错题及答案

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D.阻断病毒的传播可降低其所致疾病的发病率 6.(6.00分)在致癌因子的作用下,正常动物细胞可转变为癌细胞。有关癌细胞特点的叙述错误的是() A.细胞中可能发生单一基因突变,细胞间黏着性增加 B.细胞中可能发生多个基因突变,细胞的形态发生变化 C.细胞中的染色体可能受到损伤,细胞的增殖失去控制 D.细胞中遗传物质可能受到损伤,细胞表面的糖蛋白减少 必考题: 7.(8.00分)为研究垂体对机体生长发育的作用,某同学用垂体切除法进行实验。在实验过程中,用幼龄大鼠为材料,以体重变化作为生长发育的检测指标。问答下列问题: (1)请完善下面的实验步骤 ①将若干只大鼠随机分为A、B两组后进行处理,A组(对照组)的处理是;B组的处理是 ②将上述两组大鼠置于相同的适宜条件下饲养。 ③。 ④对所得数据进行统计处理与分析。 (2)实验结果与分析 B组大鼠生长发育的状况不如A组,出现这种差异的原因是由于B组的处理使大鼠缺失了来源于垂体的激素和激素。 8.(8.00分)为了研究某种树木树冠上下层叶片光合作用的特性,某同学选取来自树冠不同层的A、B两种叶片,分別测定其净光合速率,结果如图所示。据图回答问题:

高考状元笔记完美整理版_高中生物知识点全集(绝对精品)高考英语短文改错方法

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Unfortunate, there are too many people in my family. (Unfortunately) 需要注意的是,形容词多用来做定、表、补语等,而副词只能在句子中作状语,修饰动词、形容词、副词或整个句子。第一例中的wonderful作定语修饰time,第二句的Unfortunately作状语修饰整个句子。 四.非谓动词细辨别 这是考查最多的错误形式之一。主要有分词和动名词类错误,也包括不定式类错误。例如:…in my spare time, but now I am interesting in football. (interested) Play football not only makes us grow up tall and strong but also …(playing) My parents love me…and will do all they can ∧make sure…(to) 上述二、三例分别是动名词作主语,和不定式作目的状语。一般的,现在分词有主动态和进行时的含义,而过去分词具有被动态和完成时的含义,不定式有将来时态的含义。五.习惯用法要记住 主要考查习惯搭配方面的基础知识。这也是历年高考的常考点,其错误表现形式主要有三种:多词、少词和搭配错误。例如: It was very kind for them to meet me at the railway station and…(of) We must keep in mind that we play for the team instead ∧ourselves. (of) 六.句子成分多分析 不同的句子成分要用不同的词类;不同的语景要选择不同的词语。这些都有待我们对句子结构和句子成分作细致的分析,才能找出用词不当的错误。例如: They ∧eager to know everything about China and…(were) I live in Beijing, where is the capital of China. (which)

短文改错解题技巧

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高中英语改错练习题含答案 1 A shopkeeper once found that a bag money 56._______ had been stolen from his shop.He went to the 57._______ judge(法官)and tell him about his loss(损失).58._______ The judge ordered all people of the shop 59._______ to come before him.He took a number of the 60._______ sticks of equal length(长度)or gave one stick 61._______ to each person.Then he said,“Come after me 62._______ again tomorrow.I’ll then know which of you are 63._______ the thief because the stick given to a thief 64._______ will be one inch longer than the other.” 65._______ 2 Miss Evans taught physics in school in London.Last month 56._____she was explaining to one of her class about sound ,and 57._____ she decide to test them to see how successful she had 58._____been in her work.She said to them,“Now I has a sister 59._____ in Washington.If I was calling her by the phone,and 60._____you were on the other side of the street.Who would 61._____hear me first,my sister and you?And why?” 62._____A clever boy at once answered,“You sister,Miss 63._____Evans,because the electricity travels much faster than sound 64._____waves.” “Very well,” Miss Evans praised.65._____ 3 It is interested to visit another country,but sometimes 56.___ there ar e some questions when we don’t know the language very 57.___well.It may be difficult to talk about the people there.We may 58.___ not know how to use the telephone in the country which are 59.___visiting.We may not know what to buy the things we need.60.___ In a strange country we may not know where to eat and what 61.___ to order in a restaurant.It is not easy to decide how many 62.___money to tip(付小费)waiters or taxi drivers.When we are 63.___helpless,we may not know how to ask help.64.___After a short time later,however,we learn what to do 65.___and what to say.We learn to enjoy life in another country,and then we may be sorry to leave both the place and the people. 4 Long long ago,people had gather leaves and 56._____ fruit of plants to eat with.They didn’t know how 57._____ to plant crops or how to keep animals for their 58._____

高考英语短文改错技巧总结版,考生必看!

短文改错对考生的要求较高,是对语言知识综合运用能力的考查,检测考生发现、判断、纠正文章错误 的能力,进而考查学生的词法、句法及行文逻辑等方面的水平。考生在该项上往往失分较多,对该题感 到束手无策。但是,如果解题时能从有效掌握解题思路、出题规律及破解题目关键两大处入手,此类题 目就会迎刃而解。 短文改错解题思路和检查原则 1. 句中各部分的结构是否完整,特别是每个句子要有动词; 2. 谓语动词的时态、语态; 3. 非谓语动词的用法; 4. 名词的单、复数,格的使用是否正确; 5. 定冠词和不定冠词是否正确; 6. 代词的格和性的使用是否有误; 7. 定语从句中关系代词、关系副词是否准确无误; 8. 并列句中的并列连词、主从复合句中的从属连词用的是否得当。 短文改错解题四原则 改动以最少为原则; 虚词以添加或删除为原则; 实词以改变词形为原则; 以保持句子原意为原则。 解题注意要点和能力培养 1. 核对错项时,若的确有一时难以改出的地方,可以参考所改动项是否基本符合“1:1:8”的比例。即多一词1个,缺词1个,错词8个。 2. 核对改正的语法项目是否有重复。因为短文改错往往覆盖面广,一般不会出现重复考查某个语法点的现 象。 3. 核对答题符号是否规范,位置是否准确,看看有无遗漏符号、忽略字母大小写和拼写等问题。

解题思路(三步解题法) 第一步:快速浏览全文,把握文章的主要时态、人称及文章的主旨大意,顺便标记自己一眼就能看出的错 误。 第二步:细读文章,找出错误并改正。一般要结合文章的上下文以及出题规律来做题。 第三步:代入正确答案通读全文,看其是否通顺。 出题规律及破解关键 高考短文改错一般会在以下八个方面进行设题。 1. 动词:主要考查时态、主谓一致和固定搭配。例如: ①时态混用 Then the trouble started. We can’t open the door. So we asked the policeman for help. 。) (很显然此段的主时态是一般过去式,因此应把can’t改为couldn’t ②主谓不一致 There were a football game on TV last Saturday evening. (a football game决定了谓语动词用单数,故应该把were改为was。) ③固定搭配 He had little money left, so he had to give up buy the computer. (give up doing sth.是固定用法,故动词buy应该改为buying。) 2. 名词:主要考查单复数混用。例如: Helen is seventeen year old. She is very busy. (表示“年龄多大了”应该为复数形式,故应把year改为years。) 3. 形容词/副词:主要考查两者之间是否混用。例如: ①副词代替正确形容词 During the football season, Helen is much busier than usually. (很明显是“与平时相比较更忙”,因此需要把usually改为usual。) ②形容词代替正确副词 As the time clock showed one minute and forty-two seconds left in the game, she began cheering excited, “Come on —get going!” (显然应把excited改为excitedly,用来修饰动词cheer。) 4. 介词:主要考查固定搭配,特别是动词和介词的搭配。例如: ①介词遗漏 I’m sure you will get rid the sorrow and unhappiness caused by the disaster. (get rid of 是固定搭配,意为“摆脱,除去”。) ②介词多余 My wife is also happy because of I have given up smoking.

短文改错常考点总结

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(5)注意非谓语动词结构的使用(done doing to do)

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