初三數(shù)學(xué)相似三角形測(cè)試題及答案

1、regulations and ot her requirement s of a relevant State laws, stat utes, ordinances and norms; B of Luoyang City, Henan province, local regulations and departments under t he State Council regulations, procedures; natio

2、nal, industry, standardization of Luoyang City, Henan province, about security management laws, regulations, procedures, rules, standards and other requirements; C national, trade and local standards; D notification of a

3、uthorities, law enforcement agencies, bulletins, and other requirements; E National Convention. 2, access to a superior communi cations, zhuanwen; B-published newspapers, magazines; C conference access; D from laws, regu

4、lations, standards and other requirements distribution obtained; E by government agencies, industry associations and ot her access; F search the Internet; G other channels. 3, recog nition and identification 3.1 health a

5、nd technology according to the standardization of safety management system requirement s and related departments and units to collect information and preparation of GM of the applicable laws, regulations ... 3, about th

6、e safety of jurisdictions, report regularly to the leading group for safety production. 4, promptly report accident s, and collaborative leadership group company safety production accidents, maintenance of the scene of t

7、he accident, and tim ely rescue of casualties t o stop development. F our, duty firefighter responsibilities 1, accept the security of working arrangement s, is in charge of work safety in each specific region. 2, organi

8、zed by the security officer for conducting regular fire drills to ensure that basic firefighting skills. 3, make regular checks on production safety organized by the safety officer, fou nd safety hazards immediately halt

9、ed and proper precautionary measures, reported to t he safety officer. 4 assist the security officer is responsible for the work at the scene of the accident. Five, employee safety responsibilities 1 knowledg e of produc

10、tion safety, and actively participat e in the Organization of learning activities to enhance security awareness and consciousness. 2, strictly in accordance wit h the rules work, observe labour discipline and the rules a

11、nd regulations of the com pany. 3, the correct use of PPE. 4, company officials in a timely manner t o reflect problems in safety. Fourth chapter security meeting company set up a sound system of safety meetings, m

12、onthly summary all departments require a safety, regular analysis of the situati on of production safety measures on major safety issues, and im plementation. Safety training for the fifth chapter 1, all employees must

13、receiv e safety training and education. 2, t he company m ust be made before the new staff workshop, safety education. Employees changing jobs within t he company or who leave for more than six months back to work, shop

14、 or safety education should accordingly. 3, for all employees of the company must conduct safety training and education, should be according t o safety regulations, safety rules, discipline as an important part of safet

15、y education. 4, the com pany's special operations personnel (including electrician, driving motor vehicles in fact ories, machine operators, an d so on) must receive relevant professional training in safety knowledg

16、e, ensure qualified before they can schedule posts. Sixth chapter safety checks, companies must establish and im prove the system of safety checks. Workshop safety checks once a month, team leader safety checks once a w

17、eek. Second, compa nies should organize production status checks, routine security checks, professional safety check. Specific requirement s are: (I), post security, mainly by the staff before the operation, about your j

18、ob or the work to be undertaken, and after confirming the safe and reliable operation. Contents include: 1, if the security status of the equipment in good condition, safety protection device is effective; 2, provided s

19、ecurity measures are implemented; 3, the equipment used, whether t he tools in accordance with safety regulations; 4, job sites, as well as g oods piled up compliance with the safety specifications; 5, personal protect

20、ive equipment, appliances, complet e and reliable; 6, o peration, procedures are clear. (B) routine safety inspections, mainly by the heads of the various departments responsible for, it must further site visits and insp

21、ections .. .1, employee injuries that occur in t he process of work, must be strictly in accordance with the regulations of the company reporting, investigation, analy sis, treatment and management. 2, after a fatal acci

22、dents of workers, com pany officials should immediat ely organize to sav e the victims, take effective measures to prevent t he expansion and protection of the scene of the accident, rehabilitation efforts and report gro

23、up. Tenth chapter by-laws of the sy stem come into force on the date of promulgation. Six, a security safeg uard sy stem and objective: costs for necessary in order t o ensure the safety of production, e

24、nsure enterprise security inv estment funds and im proved working conditions, according to the extraction of determines the criteria yourself, and have the courage to produce shall not be diverted to any other use. Secon

25、d, scope this policy applies to the funds of input in production safety management . Three, responsibilities 1, Chairman of the Board is responsible for determining safety extraction of investment criteria and the fundin

26、g necessary to ensure the safety of production. 2, carbon susheng technology is responsible for the devel opment of the sy stem of safety investment to protect, supervise and inspect the use of inv estment funds t o secu

27、rity . 3, finance charge based on t he safety investment protection sy stem, establishing the security expense account records t he cost of extraction and the use of security costs. Four, according t o the financial mana

28、gement of the high-risk industry enterprise safety in production costs of the int erim measures (financial enterprises, No. 478) requirements, com bined with the act ual situation in enterprise security costs that year e

29、xtraction is based on act ual sales of the year for accrual basis, using ex cess regressiv e manner, ac cording to extracts to cut 2. 1, annual sales income in part up to 10 million Yuan, according to the extract to cut

30、4. 2, ann ual sales income in the 10 million Yuan t o 100 million Yuan (included) parts, extract to cut by 2. 3, the annual sales income of RMB 100 million to 1 billion yuan (included) parts, extract 0.5 per cent respect

31、ively . 4, part of the annual sales income of more than 1 billion yuan, according to the extract to cut 0.2. 5, and developed contains following aspects of safety cost s of using plans, and implementation: ⑴, and perfect

32、, and transformation and maintenance security protection equipment facilities spending, which: security 初三數(shù)學(xué) 初三數(shù)學(xué)相似三角形 相似三角形測(cè)試題及答案 測(cè)試題及答案 1、若 b m m a 2 , 3 ? ? ，則 _____ : ? b a 。 2、已知 6 5 3z y x ? ?，且 6 2 3 ? ? z y ，則 _

33、_____ ____, ? ? y x 。 3、在等腰 Rt△ABC 中，斜邊長(zhǎng)為c ，斜邊上的中線長(zhǎng)為m ，則 ______ : ? c m 。 4、反向延長(zhǎng)線段 AB 至 C，使 2AC＝AB，那么 BC：AB＝ 。 5、△ABC∽△A′B′C′，相似比為3：2，它們周長(zhǎng)的差為40厘米，則△A′B′C′的周長(zhǎng)為 厘米。 7、如圖，△ABC 中，∠ACB＝90°，CD⊥AB 于 D，若∠A＝30°，則

34、 BD：BC＝ 。若 BC＝6，AB＝10，則 BD＝ ，CD＝ 。 8、如圖，梯形 ABCD 中，DC∥AB，DC＝2cm，AB＝3.5cm，且 MN∥PQ∥AB， DM＝MP＝PA，則 MN＝ ，PQ＝ 。 9、如圖，四邊形 ADEF 為菱形，且 AB＝14，BC＝12，AC＝10，那 BE＝ 。 10、梯形的上底長(zhǎng) 1.2 厘米，下底長(zhǎng) 1.8 厘米，高 1 厘米，延長(zhǎng)兩腰后與下底所成的三角

35、形的高為 厘米。 11、下面四組線段中，不能成比例的是（ ） A、 4 , 2 , 6 , 3 ? ? ? ? d c b aB、 3 , 6 , 2 , 1 ? ? ? ? d c b aC、 10 , 5 , 6 , 4 ? ? ? ? d c b aD、 3 2 , 15 , 5 , 2 ? ? ? ? d c b a12、等邊三角形的中線與中位線長(zhǎng)的比值是（ ） A、 1 : 3B、 2 : 3C、 23 : 21D、

36、1：3 C B D A D C N P N Q A B A D B F E C regulations and ot her requirement s of a relevant State laws, stat utes, ordinances and norms; B of Luoyang City, Henan province, local regulations and departments under t he

37、 State Council regulations, procedures; national, industry, standardization of Luoyang City, Henan province, about security management laws, regulations, procedures, rules, standards and other requirements; C national, t

38、rade and local standards; D notification of authorities, law enforcement agencies, bulletins, and other requirements; E National Convention. 2, access to a superior communications, zhuanwen; B-published newspapers, magaz

39、ines; C conference access; D from laws, regulations, standards and other requirements distribution obtained; E by government agencies, industry associations and ot her access; F search the Internet; G other cha nnels. 3,

40、 recog nition and identification 3.1 health and technology according to the standardization of safety management system requirement s and related departments and units to collect information and preparation of GM of the

41、applicable laws, regulations ... 3, about the safety of jurisdictions, report regularly to the leading group for safety production. 4, promptly report accident s, and collaborative leadership group company safety produc

42、tion accidents, maintenance of the scene of the accident, and tim ely rescue of casualties t o stop development. F our, duty firefighter responsibilities 1, accept the security of working arrangement s, is in charge of w

43、ork safety in each specific region. 2, organized by the security officer for conducting regular fire drills to ensure that basic firefighting skills. 3, make regular checks on production safety organized by the safety of

44、ficer, found safety hazards immediately halted and proper precautionary measures, reported to t he safety officer. 4 assist the security officer is responsible for the work at the scene of the accident. Five, employee sa

45、fety responsibilities 1 knowledg e of production safety, and actively participat e in the Organization of learning activities to enhance security awareness and consciousness. 2, strictly in accordance wit h the rules wor

46、k, observe labour discipline and the rules and regulations of the com pany. 3, the correct use of PPE. 4, company officials in a timely manner t o reflect problems in safety. Fourth chapter security meeting company

47、 set up a sound system of safety meetings, monthly summary all departments require a safety, regular analysis of the situation of production safety measures on major safety issues, and im plementation. Safety training f

48、or the fifth chapter 1, all employees must receiv e safety training and education. 2, t he company m ust be made before the new staff workshop, safety education. Employees changing jobs within t he company or who leave

49、for more than six months back to work, shop or safety education should a ccordingly. 3, for all employees of the company must conduct safety training and education, should be according t o safety regulations, safety rul

50、es, discipline as an important part of safety education. 4, the com pany's special operations personnel (including electrician, driving motor vehicles in fact ories, machine operators, and so on) must receive releva

51、nt professional training in safety knowledge, ensure qualified before they can sched ule posts. Sixth chapter safety checks, companies must establish and improve the system of safety checks. Workshop safety ch ecks once

52、 a month, team leader safety checks once a week. Second, companies should organize production status checks, routine security checks, professional safety check. Specific requirement s are: (I), post security, mainly by t

53、he staff before the operation, about your job or the work to be undertaken, and after confirming the safe and reliable operation. Contents include: 1, if the s ecurity status of the equipment in good condition, safety pr

54、otection device is effective; 2, provided security measures are implemented; 3, the equipment used, whether t he tools in accordance with safety regulations; 4, job sites, as well as g oods piled up compliance with th

55、e safety specifications; 5, personal protective equipment, appliances, complet e and reliable; 6, o peration, procedures are clear. (B) routine safety inspections, mainly by the heads of the various departments responsib

56、le for, it must further site visits and inspections .. .1, employee injuries that occur in t he process of work, must be strictly in accordanc e with the regulations of the company reporting, investigation, analy sis, tr

57、eatment and management. 2, after a fatal accidents of workers, com pany officials should immediat ely organize to sav e the victims, take effective measures to prevent t he expansion an d protection of the scene of the a

58、ccident, rehabilitation efforts and report group. Tenth chapter by-laws of the sy stem come into force on the date of promulgation. Six, a security safeg uard sy stem and objective: costs for necessary i

59、n order t o ensure the safety of production, ensure enterprise security inv estment funds and im proved working conditions, according to the extraction of determines the criteria yourself, and have the courage to produce

60、 shall not be diverted to any other use. Second, scope this policy applies to the funds of input in production safety management . Three, responsibilities 1, Chairman of the B oard is responsible for determining safety e

61、xtraction of investment criteria and the funding necessary to ensure the safety of production. 2, carbon susheng technology is responsible for the development of the sy stem of safety investment to protect, supervise and

62、 inspect the use of inv estment funds t o security . 3, finance charge based on t he safety investment protection sy stem, establishing the security expense account records t he cost of extraction and the use of security

63、 costs. Four, according t o the fina ncial management of the high-risk industry enterprise safety in production costs of the int erim measures (financial enterprises, No. 478) requirements, com bined with the act ual sit

64、uation in enterprise security costs that year extraction is based on act ual sales of the year for accrual basis, using ex cess regressiv e manner, according to extracts to cut 2. 1, annual sales income in part up to 10

65、million Yuan, according to the extract to cut 4. 2, annual sales income in the 10 million Yuan t o 100 million Yuan ( included) parts, extract to cut by 2. 3, the annual sales income of RMB 100 million to 1 billion yuan

66、(included) parts, extract 0.5 per cent respectively . 4, part of the annual sales income of more than 1 billion yuan, according to the extract to cut 0.2. 5, and developed contains following aspects of safety cost s of u

67、sing plans, and implementation: ⑴, and perfect, and transformation and maintenance security protection equipment facilities spending, which: security 24、如圖，RtΔABC 中斜邊 AB 上一點(diǎn) M，MN⊥AB 交 AC 于 N，若 AM＝3 厘米，AB：AC＝5：4，求 MN 的長(zhǎng)。

68、 25.在 ABC △ 中， 90 BAC ? ? ， AD 是 BC 邊上的高， E 是 BC 邊上的一個(gè)動(dòng)點(diǎn)（不與B C ， 重合）， EF AB ? ， EG AC ? ，垂足分別為 F G ， ． （1）求證：EG CGAD CD ?； （2）FD 與 DG 是否垂直？若垂直，請(qǐng)給出證明；若不垂直，請(qǐng)說(shuō)明理由； （3）當(dāng) AB AC ? 時(shí)， FDG △ 為等腰直角三角形嗎？并說(shuō)明理由．（12 分） 26、 （14 分） 如圖，