2022年北师大版小学三年级数学下册教学反思 .pdf

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1、blind Board operational security requirements 1. blocking blind Board operations required to handle blocking blind Board operating license, no blocking blind Board operating license are not allowed to smoke blocking blind Board operations. 2. it is strictly prohibited to alter, lent t he bl ocking b

2、lind Board operating license. Content conversion and expansi on of operations or transfer jobs site, again for blocking blind Board operating license. 3. incomplete job approval proce dures, safety measures are not implemented, work environment does not meet security requirements, workers have the r

3、ight to refuse to work. 4. toxic gas pipi ng, e qui pment blocking blind Board, non-irritant gas pressure should be less than 200 mm Hg; irritant gas pressure should be less than 50 mm Hg; gas temperature should be less than 60 degrees. 5. Tchnical Department responsi ble for drawing blind location

4、map, numbers the blind, construction personnel work, blind location map by technology archive for future reference. 6. the blind plug operating personnel must wear appropriate personal protective equipment, must designate a person responsible for bl ocking blind Boar d work, and to designate a perso

5、n responsible for monitoring. Guardians are advised by experienced officers. , Guardian jobs people must wear appropriate protective equipment as require d, and guardians must check, implementing relevant safety measures on the job. Guar dians must adhere to the scene, and emergency treatment. Job g

6、uardian shall not leave the job site before the end. 7. the job complicated, dangerous place s, apart from the guardian, also company leadership, safety and Environment Department, is responsible for personnel. Involving the entire production system, head of the technical department must be present.

7、 8. in pla ces where inflammable and explosive work, place within 30 metres without hot work operati ons; task lighting should use explosion-proof lamps and explosion-proof tools shoul d be used, prohibition of beating with an iron pi pe, flange, etc. 9. high blocking blind Board operation shall fol

8、low the provisi ons of license for working at height. 10. construction unit to blind a lot according to the requirements of the permit to work, the implementation of safety measures, work can be carried out. 11. s strictly prohibited on the same pipe simultaneously in two places and two or more bloc

9、king blind Boar d operations. When pl ugging multiple blind, blind to blind location map and plates number by construction GeneraManager, unity of command assignments. 12. signs in each blocking blind Board shows that blind l ocati on. (C) the blocking blind Board permits the management of 1. . Bli

10、nd location map, implement security measures, after the approval of the technical department, assignment units (staff) to confirm. Job complex, dangerous places require d security audits of the Department of environmental protection, the company in charge of safety Vice President for approval. 4. ap

11、prove a good blocking blind Board operating license i n triplicate, main contractors, operating units, e ach hold a copy of the bio secti on. 5. after the end of the job, jobs, technicalcheck, activity handed the blind l ocation technology. 6. work permits management should establish the ticket file

12、 (inventory), the ticket is kept for 3 years. The lifting operation management system, purpose in order to control the production within the region, lifting, lifting activities to prevent the occurrence of accidents, the system is formulated. Second, the scope of application of this system applies t

13、o all companies within the lifting operation. Third, lifting a license of graded credit three levels of management: (I) General equipment, weighing less than 1 ton of weight lifting, the lifting of the rules, technology revie w, workshop Director for approval; (B) the rules of weight equal to or gre

14、ater than 1 ton less than 10 tons of weight lifting, hoisting, appr oved by the workshop, equi pment Management Department for appr oval. (C) of over 10 tons and heavy lifting operations projects or constructi on under the special conditions, shall prepare lifting plan, permit to work submitted to c

15、ompany executives and safety equipment, the joint security sector review competent after Assistant General Manager approval. Four, lifting safety requirements 1. lifting weights greater than or equal to 10 tonnes of the object and the subject of civil engineeri ng structures, hoisting construction p

16、lan shall be prepared. Load is less t han 10 tonnes, but small complex shapes, stiffness, length-diameter ratio, precisi on preci ous, under the special conditi ons of construction, should also prepare construction programmes. Hoisting construction programmes examined by the project authorities, sub

17、mitted to the competent VP approval to be implemented. 2. lifting operations must set up the alert line and set up special care, guardianship per sonnel must wear armbands, lifting regional staff out of bounds; 3. lifting operations must be pr ovide d for lifting loads, slings, rigging and economic

18、cal culation options, do not overload. When lifting heavy objects close to or reach t he rated lifting capacity, check brakes, low height, short stroke after the load test, then smoothly lifted. Large and medium sized equipment before lifting, load test should be carried out. Try hanging height for

19、about 0.2m and then conduct a reliability check (including the sele ction and calculati on of safety factor). Overload lifting is strictly pr ohi bited. 4. before lifting must pad the wood and the wood used must be of adequate size (be sure to over 1 m); when lifting requires fire escape, y ou must

20、contact the circuit breaker in accorda nce with the provisi ons; 5. liftingoperations must be run on all kinds of hoisting machi nery parts, safety devices as well as slings, rigging a detailed security che cks, security devices for lifting equipment is se nsitive and reliable, no illness. Must try

21、before lifting crane, confirmed before they can work. 6. lifting operations, removed platform guardrail must be restored (the bolt activity fence removal is strictly prohibited); 7. lifting operations, should have adequate lighting at night, outdoor . 16, lifting the approval procedure is not comple

22、te, security measures are not北师大版小学三年级数学下册教学反思“元、角、分与小数”这一单元是学生第一次学习小数。教材的设计意图是让学生在“元、角、分”的情境中学习小数及其简单加减运算的初步知识。学完买文具后，在练习反馈中出现了这样的问题：如“ 3.21 元”读作“三元二角一分”这也是同事们谈论的话题。我认为这是学生把小数的意义与读法混淆了，一个小数是由整数部分、小数点、和小数部分组成的。整数部分按原来的读数方法读，小数点读做“点”，小数部分要依次读出每个数位上的数。所以3.21 元读作：三点二一元。而把元、角、分用元做单位的小数表示时， 小数点左边表示几元， 小数

23、点右边不满 1 元，则表示几角几分。教学过程中我们应该让学生进一步体会小数的产生，明确小数点右边两位表示几角几分，帮助学生建立元、角、分与“用元作单位的小数”的对应关系。学生对小数的认识都是建立在元角分的基础上，所以造成了学生对小数的认识仅限于钱。学生看到小数就在其后加上单位“元” ，出现了认识的局限性。针对这种情况我在教学中进行了一些补充，生活中的小数如：我的视力是1.5，我的身高是 1.56 米，我的体重是48.5千克，我的 50 米赛跑成绩是5.98 秒等等。个人认为，在初步认识小数的教学中为学生提供一个直观、具体的模型，有助于帮助学生理解小数的意义，但过于依赖这一数学模型会阻碍学生的思

24、维，所以有必要拓宽小数的意义教学。元角分与小数教学反思元角分与小数”是学生第一次学习小数。教材的设计意图是在“元角分”的情境中学习小数及其简单的加减运算，为此，教材安排了“买文具”、 “货比三家”、 “买书”、 “寄书”等具体情境。 “买文具”时，会看到文具标价牌上用小数表示的价格，从而自然地引出小数；然后把这些小数改写为几元几角几分、 再把几元几角几分改写为小数表示的过程经历，使学生初步理解了小数的具体意义，体会到小数与它所表示的实际的量的单位之间的联系。但在读小数时却出现了口头读对了，书面表达却出现小数部分的读法和整数部分的读法混淆。在“货比三家”中，凭借生活经验，大多数同学都能很快判断出

25、两个小数谁大谁小，但在交流思考的过程时，却大都缺乏完整的表述； 让人郁闷的是： 在完成作业“去哪家文具店买橡皮最便宜？”时，凭借生活经验，他们很快就找到答案，却出现了“2.63 元2.36 元2.65元”这样的书面表达。“买书”与“寄书”的问题情境，是为理解一位小数加减运算的意义及算法而创设的。可以说一位小数没有进位的加法和进位加法与一位数没有退位的减法，是学得不错的。在解决教材P8“小红付给阿姨 15 元，应找回多少元？”这个问题时，或许是具体情境的存在，结果也很快地出来了。北师大版 3 年级数学下册买文具课后反思买文具 是北师大版小学数学三年级下册的内容。这一课是学生第一次认识小数，是对小

26、数意义的最初步的了解。 教学时我结合买文具的生活情境，在购物的活动中， 让学生通过观察标价牌上用小数表示的价格， 自然的引入小数； 再经历把这些表示价格的小数改写为几元几角几分的形式，和把几元几角几分改写为小数表示的过程，初步理解小数的具体意义，认识小数的特征，并会认、读、写简单的小数，同时让学生充分地体会数学与实际生活的密切联系，感受数学就在身边。教学伊始，我设计了这样的情境：星期天笑笑去文具店买文具，可是文具店里的标价牌上的标价她看不太明白， 因此想请同学们帮帮忙。 你们愿意吗？你能从这幅图里得到哪些数学信息？学生在解读主题图的时候找到小数，发现这些数和我们以前学过的数不一样，不是整数元的

27、，有的不到1元。由于大部分学生都有购物的经历，因此他们对于标价所表示的几元几角几分能够很清楚地知道，我及时地抓住这个时机，趁热打铁，研究这些价格的组成部分，让他们小组讨论这些数的共同特点，从而了解小数的意义： 当我们不能用整数表示一个数的时候就可以用小数来表示，如角是元的一半，不能用元来表示，我们就可以用0.50 元来表示。像 0.50、8.00、3.50、16.85、1.06 等这些数我们就叫做小数。在讲小数点的重要性时，我为学生讲了这样一个故事：1970年 6 月 30 日，前苏联著名宇航员费拉迪米尔科马洛夫在空间站工作了23 天后，一个人驾驶着“联盟一号”宇宙飞船返航。但是，当飞机返回大

28、气层后，无论怎么操作也打不开降落伞， 结果在着陆基地附近坠毁宇航英雄科马洛夫遇难。“联盟一号” 所发生的事件就是因为在地面检查时，忽略了一个小数点。 让我们记住小数点所酿成的悲剧吧！我们在数学学习中，不能有半点的疏忽，不然就要酿成严重的后果。孩子们对小数点的作用精选学习资料 - - - - - - - - - 名师归纳总结 - - - - - - -第 1 页，共 13 页blind Board operational security requirements 1. blocking blind Board operations required to handle blocking bli

29、nd Board operating license, no blocking blind Board operating license are not allowed to smoke blocking bli nd Board operations. 2. it is strictly prohibited to alter, lent t he bl ocking blind Board operating license. Conte nt conversion and expansi on of operations or transfer jobs site, again for

30、 blocking blind Board operating license. 3. incomplete job approval proce dures, safety measures are not implemented, work environment does not meet security requirements, workers have the right to refuse to work. 4. toxic gas pipi ng, e qui pment blocking blind Board, non-irritant gas pressure shou

31、ld be less than 200 mm Hg; irritant gas pressure should be less than 50 mm Hg; gas temperature should be less than 60 degrees. 5. Tchnical Department responsi ble for drawing blind location map, numbers the blind, construction personnel work, blind location map by technology archive for future refer

32、ence. 6. the blind plug operating personnel must wear appropriate personal protective equipment, must designate a person responsible for bl ocking blind Boar d work, and to designate a person responsible for monitoring. Guardians are advised by experienced officers. , Guardian jobs people must wear

33、appropriate protective equipment as require d, and guardians must check, implementing relevant safety measures on the job. Guar dians must adhere to the scene, and emergency treatment. Job guardian shall not leave the job site before the end. 7. the job complicated, dangerous place s, apart from the

34、 guardian, also company leadership, safety and Environment Department, is responsible for personnel. Involving the entire production system, head of the technical department must be present. 8. in pla ces where inflammable and explosive work, place within 30 metres without hot work operati ons; task

35、 lighting should use explosion-proof lamps and explosion-proof tools shoul d be used, prohibition of beating with an iron pi pe, flange, etc. 9. high blocking blind Board operation shall follow the provisi ons of license for working at height. 10. construction unit to blind a lot according to the re

36、quirements of the permit to work, the implementation of safety measures, work can be carried out. 11. is strictly prohibited on the same pipe simultaneously in two places and two or more blocking blind Boar d operations. When pl ugging multiple blind, blind to blind location map and plates number by

37、 construction GeneraManager, unity of command assignments. 12. signs in each blocking blind Board shows that blind l ocati on. (C) the blocking blind Board permits the management of 1. . Bli nd location map, implement security measures, after the approval of the technical department, assignment unit

38、s (staff) to confirm. Job complex, dangerous places require d security audits of the Department of environmental protection, the company in charge of safety Vice President for approval. 4. approve a good blocking blind Board operating license i n triplicate, main contractors, operating units, e ach

39、hold a copy of the bio secti on. 5. after the end of the job, jobs, technicalcheck, activity handed the blind l ocation technology. 6. work permits management should establish the ticket file (inventory), the ticket is kept for 3 years. The lifting operation management system, purpose in order to co

40、ntrol the production within the region, lifting, lifting activities to prevent the occurrence of accidents, the system is formulated. Second, the scope of application of this system applies to all companies within the lifting operation. Third, lifting a license of graded credit three levels of manag

41、ement: (I) General equipment, weighing less than 1 ton of weight lifting, the lifting of the rules, technology revie w, workshop Director for approval; (B) the rules of weight equal to or greater than 1 ton less than 10 tons of weight lifting, hoisting, appr oved by the workshop, equi pment Manageme

42、nt Department for appr oval. (C) of over 10 tons and heavy lifting operations projects or constructi on under the special conditions, shall prepare lifting plan, permit to work submitted to company executives and safety equipment, the joint security sector review competent after Assistant General Ma

43、nager approval. Four, lifting safety requirements 1. lifting weights greater than or equal to 10 tonnes of the object and the subject of civil engineeri ng structures, hoisting construction plan shall be prepared. Load is less t han 10 tonnes, but small complex shapes, stiffness, length-diameter rat

44、io, precisi on preci ous, under the special conditi ons of construction, should also prepare construction programmes. Hoisting construction programmes examined by the project authorities, submitted to the competent VP approval to be implemented. 2. lifting operations must set up the alert line and s

45、et up special care, guardianship per sonnel must wear armbands, lifting regional staff out of bounds; 3. lifting operations must be provide d for lifting loads, slings, rigging and economic cal culation options, do not overload. When lifting heavy objects close to or reach t he rated lifting capacit

46、y, check brakes, low height, short stroke after the load test, then smoothly lifted. Large and medium sized equipment before lifting, load test should be carried out. Try hanging height for about 0.2m and then conduct a reliability check (including the sele ction and calculation of safety factor). O

47、verload lifting is strictly prohi bited. 4. before lifting must pad the wood and the wood used must be of adequate size (be sure to over 1 m); when lifting requires fire escape, y ou must contact the circuit breaker in accorda nce with the provisions; 5. liftingoperations must be run on all kinds of

48、 hoisting machi nery parts, safety devices as well as slings, rigging a detailed security che cks, security devices for lifting equipment is se nsitive and reliable, no illness. Must try before lifting crane, confirmed before they can work. 6. lifting operations, removed platform guardrail must be r

49、estored (the bolt activity fence removal is strictly prohibited); 7. lifting operations, should have adequate lighting at night, outdoor . 16, lifting the approval procedure is not complete, security measures are not印象非常深刻，有的孩子还把故事讲给了家长听。巩固练习时我发现有不少学生对于“贰圓、贰角、壹角、壹分、贰分”小面额的人民币不认识，其原因：一是因为学生对汉字的“壹、贰、叁

50、, ”不认识，二是因为有些小面额的人民币目前已经很少见了，有的已经不流通了，学生不认识。发现问题后，我及时把“壹、贰、伍、拾”这几个汉字写在黑板上，并在字上注上了拼音，让学生读一读，这样学生在完成第三页“练一练”第一题：用小数写出具体的几张钱币为几点几元时错误就少多了。我还要求学生这样表述：“几个几元几个几角几个几分合起来是几元几角几分，写成几点几元。”这样不但训练了学生的语言表达能力，而且用“合起来”的回答方式可以帮助他们今后理解小数加法的算理。以前在课结束时，我经常因为时间不够省略了让学生回顾、总结这一环节，我知道总结能培养学生自我反思的习惯， 提高自我梳理知识的能力， 所以这节课我没有省