1、 AEROSPACE STANDARD HOSE ASSEMBLY, POLYTETRAFLUOROETHYLENE,METAL BRAID, MEDIUM PRESSURE, FLARED, STRAIGHT TO STRAIGHT AS640Copyright 2011 SAE International All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, el
2、ectronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org ISSUED
3、2007-03REVISED 2011-06THIRD ANGLE PROJECTION CUSTODIAN: SAE G-3/G-3D REV.AFEDERAL SUPPLY CLASS AS640 SHEET 1 OF 7 REV. A PROCUREMENT SPECIFICATION: /15/ AS1946SAE Technical Standards Board Rules provide that: “This report ispublishedby SAE toadvance thestate of technicalandengineeringsciences.The us
4、eofthis reportisentirelyvoluntary, andits applicability and suitability forany particular use,including any patent infringement arising therefrom, isthe soleresponsibilityofthe user.”SAE reviews eachtechnicalreportat least every five years at which time itmay bereaffirmed,revised,orcancelled.SAE inv
5、ites yourwrittencomments andsuggestions. SAE values your input. To provide feedbackon this Technical Report, please visit http:/www.sae.org/technical/standards/AS640A RATIONALE ESTABLISH CUFF DIMENSIONAL REQUIREMENTS FOR INTEGRAL FIRE SLEEVE ON HOSE AND SLEEVE CODE H & J CONFIGURATIONS, FOR STANDARI
6、ZATION PURPOSES. FIGURE 1 - HOSE ASSEMBLY FIGURE 2 - ABRASION SLEEVE ATTACHMENT /7/ /8/ FIGURE 3 SEE TABLE 7 /26/ AEROSPACE STANDARD AS640 SHEET 2 OF 7 REV. A HOSE ASSEMBLY, POLYTETRAFLUOROETHYLENE, METAL BRAID, MEDIUM PRESSURE, FLARED, STRAIGHT TO STRAIGHT TABLE 1 - DIMENSIONS HOSE ASSEMBLY NO. & S
7、IZE /24/ HOSE SIZE (REF) FITTING TYPE /25/ FITTING MATERIAL /5/ THREAD T PER AS8879 (REF) HOSE ID MIN (REF) A MAX C MIN BALL DIA /16/ E MAX WITHOUT SLEEVING /17/ F HEX (REF) AS640D (-03) AS640D (-03) AS640D (-03) .188 .188 .188 - S E - CRES AL TI CRES AL TI - .3750-24UNJF-3B.3750-24UNJF-3B.3750-24UN
8、JF-3B.4375-20UNJF-3B.4375-20UNJF-3B.4375-20UNJF-3B- .110 .110 .110 .110 .110 .110 - 1.14 1.14 1.14 1.14 1.14 1.14 - .072 .072 .072 .072 .072 .072 - .49 .49 .49 .49 .49 .49 - .500 .500 .500 .562 .562 .562 AS640E (-04) AS640E (-04) AS640E (-04) .250 .250 .250 R S E CRES AL TI CRES AL TI CRES AL TI .37
9、50-24UNJF-3B.3750-24UNJF-3B.3750-24UNJF-3B.4375-20UNJF-3B.4375-20UNJF-3B.4375-20UNJF-3B.5000-20UNJF-3B.5000-20UNJF-3B.5000-20UNJF-3B.173 .173 .173 .173 .173 .173 .173 .173 .173 1.14 1.14 1.14 1.14 1.14 1.14 1.26 1.26 1.26 .072 .072 .072 .119 .119 .119 .119 .119 .119 .55 .55 .55 .55 .55 .55 .55 .55 .
10、55 .500 .500 .500 .562 .562 .562 .625 .625 .625 AS640F (-05) AS640F (-05) AS640F (-05) .313 .313 .313 R S E CRES AL TI CRES AL TI CRES AL TI .4375-20UNJF-3B.4375-20UNJF-3B.4375-20UNJF-3B.5000-20UNJF-3B.5000-20UNJF-3B.5000-20UNJF-3B.5625-18UNJF-3B.5625-18UNJF-3B.5625-18UNJF-3B.235 .235 .235 .235 .235
11、 .235 .235 .235 .235 1.26 1.26 1.26 1.26 1.26 1.26 1.38 1.38 1.38 .119 .119 .119 .174 .174 .174 .174 .174 .174 .63 .63 .63 .63 .63 .63 .63 .63 .63 .562 .562 .562 .625 .625 .625 .688 .688 .688 AS640G (-06) AS640G (-06) AS640G (-06) .375 .375 .375 R S E CRES AL TI CRES AL TI CRES AL TI .5000-20UNJF-3B
12、5000-20UNJF-3B.5000-20UNJF-3B.5625-18UNJF-3B.5625-18UNJF-3B.5625-18UNJF-3B.7500-16UNJF-3B.7500-16UNJF-3B.7500-16UNJF-3B.298 .298 .298 .298 .298 .298 .298 .298 .298 1.38 1.38 1.38 1.38 1.38 1.38 1.61 1.61 1.61 .174 .174 .174 .230 .230 .230 .230 .230 .230 .70 .70 .70 .70 .70 .70 .70 .70 .70 .625 .625
13、 .625 .688 .688 .688 .875 .875 .875 AS640H (-08) AS640H (-08) AS640H (-08) .500 .500 .500 R S E CRES AL TI CRES AL TI CRES AL TI .5625-18UNJF-3B.5625-18UNJF-3B.5625-18UNJF-3B.7500-16UNJF-3B.7500-16UNJF-3B.7500-16UNJF-3B.8750-14UNJF-3B.8750-14UNJF-3B.8750-14UNJF-3B.391 .391 .391 .391 .391 .391 .391 .
14、391 .391 1.61 1.61 1.61 1.61 1.61 1.61 1.80 1.80 1.80 .230 .230 .230 .306 .306 .306 .306 .306 .306 .83 .83 .83 .83 .83 .83 .83 .83 .83 .688 .688 .688 .875 .875 .875 1.000 1.000 1.000 AEROSPACE STANDARD AS640 SHEET 3 OF 7 REV. A HOSE ASSEMBLY, POLYTETRAFLUOROETHYLENE, METAL BRAID, MEDIUM PRESSURE, FL
15、ARED, STRAIGHT TO STRAIGHT HOSE ASSEMBLY NO. & SIZE /24/ HOSE SIZE (REF) FITTING TYPE /25/ FITTING MATERIAL /5/ THREAD T PER AS8879 (REF) HOSE ID MIN (REF) A MAX C MIN BALL DIA /16/ E MAX WITHOUT SLEEVING /17/ F HEX (REF) AS640J (-10) AS640J (-10) AS640J (-10) .625 .625 .625 R S E CRES AL TI CRES AL
16、 TI CRES AL TI .7500-16UNJF-3B.7500-16UNJF-3B.7500-16UNJF-3B.8750-14UNJF-3B.8750-14UNJF-3B.8750-14UNJF-3B1.0625-12UNJ-3B1.0625-12UNJ-3B1.0625-12UNJ-3B.485 .485 .485 .485 .485 .485 .485 .485 .485 1.80 1.80 1.80 1.80 1.80 1.80 1.96 1.96 1.96 .306 .306 .306 .387 .387 .387 .387 .387 .387 .97 .97 .97 .97
17、 .97 .97 .97 .97 .97 .875 .875 .875 1.000 1.000 1.000 1.250 1.250 1.250 AS640K (-12) AS640K (-12) AS640K (-12) .750 .750 .750 R S E CRES AL TI CRES AL TI CRES AL TI .8750-14UNJF-3B.8750-14UNJF-3B.8750-14UNJF-3B1.0625-12UNJ-3B1.0625-12UNJ-3B1.0625-12UNJ-3B1.3125-12UNJ-3B1.3125-12UNJ-3B1.3125-12UNJ-3B
18、615 .615 .615 .615 .615 .615 .615 .615 .615 1.96 1.96 1.96 1.96 1.96 1.96 2.32 2.32 2.32 .387 .387 .387 .493 .493 .493 .493 .493 .493 1.17 1.17 1.17 1.17 1.17 1.17 1.17 1.17 1.17 1.000 1.000 1.000 1.250 1.250 1.250 1.500 1.500 1.500 AS640M (-16) AS640M (-16) AS640M (-16) 1.000 1.000 1.000 R S E CRE
19、S AL TI CRES AL TI CRES AL TI 1.0625-12UNJ-3B1.0625-12UNJ-3B1.0625-12UNJ-3B1.3125-12UNJ-3B1.3125-12UNJ-3B1.3125-12UNJ-3B1.6250-12UNJ-3B1.6250-12UNJ-3B1.6250-12UNJ-3B.851 .851 .851 .851 .851 .851 .851 .851 .851 2.32 2.32 2.32 2.32 2.32 2.32 2.37 2.37 2.37 .493 .493 .493 .700 .700 .700 .700 .700 .700
20、1.52 1.52 1.52 1.52 1.52 1.52 1.52 1.52 1.52 1.250 1.250 1.250 1.500 1.500 1.500 1.812 1.812 1.812 AS640N (-20) AS640N (-20) AS640N (-20) 1.250 1.250 1.250 R S E CRES AL TI CRES AL TI CRES AL TI 1.3125-12UNJ-3B1.3125-12UNJ-3B1.3125-12UNJ-3B1.6250-12UNJ-3B1.6250-12UNJ-3B1.6250-12UNJ-3B1.8750-12UNJ-3B
21、1.8750-12UNJ-3B1.8750-12UNJ-3B1.101 1.101 1.101 1.101 1.101 1.101 1.101 1.101 1.101 2.37 2.37 2.37 2.37 2.37 2.37 2.40 2.40 2.40 .700 .700 .700 .900 .900 .900 .900 .900 .900 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 1.500 1.500 1.500 1.812 1.812 1.812 2.125 2.125 2.125 AS640P (-24) AS640P (-24) A
22、S640P (-24) 1.500 1.500 1.500 R S - CRES AL TI CRES AL TI - 1.6250-12UNJ-3B1.6250-12UNJ-3B1.6250-12UNJ-3B1.8750-12UNJ-3B1.8750-12UNJ-3B1.8750-12UNJ-3B- 1.344 1.344 1.344 1.344 1.344 1.344 - 2.40 2.40 2.40 2.40 2.40 2.40 - .900 .900 .900 1.125 1.125 1.125 - 2.28 2.28 2.28 2.28 2.28 2.28 - 1.812 1.812
23、 1.812 2.125 2.125 2.125 - AEROSPACE STANDARD AS640 SHEET 4 OF 7 REV. A HOSE ASSEMBLY, POLYTETRAFLUOROETHYLENE, METAL BRAID, MEDIUM PRESSURE, FLARED, STRAIGHT TO STRAIGHT TABLE 2 - TOLERANCES HOSE ASSEMBLY LENGTH TOLERANCE UNDER 18 IN 18 TO 36 IN EXCLUSIVE 36 TO 50 IN EXCLUSIVE 50 IN AND OVER .125 .
24、250 .500 1% TABLE 3 - HOSE AND SLEEVE CODES HOSE OR SLEEVE CODE SLEEVE MATERIAL TEMP. LIMIT F - A B C E F G H J K L (-) INDICATES HOSE ONLY, NO SLEEVE (AS1946) ABRASION SLEEVE TUBULAR (PTFE - AS1291 - CODE B) /7/ ABRASION SLEEVE COIL (NYLON AS1294) /8/ FIRE SLEEVE (AS1072 SIL-FG) (15 MIN) /9/ /10/ /
25、14/ ABRASION SLEEVE SHRINK-ON (FEP) /12/ ABRASION SLEEVE SHRINK-ON (POLYOLEFIN AS1073 - CODE B) /12/ E FIRE SLEEVE (AS1072 SIL-FG) (5 MIN) /9/ 10/ /13/ FIRE SLEEVE INTEGRAL SILICONE (AS1723) (15 MIN) /14/ /26/ FIRE SLEEVE INTEGRAL SILICONE (5 MIN) /13/ /26/ INTEGRAL ABRASION SLEEVE (BRAIDED) POLYEST
26、ER /11/ ABRASION SLEEVE COIL (PTFE - AS1293) /8/ 450 450 275 450 350 275 450 450 450 300 450 TABLE 4 - HOSE AND OUTSIDE SLEEVE DIAMETERS HOSE OR SLEEVE CODE TOLERANCE HOSE SIZE /6/ .188 HOSE SIZE /6/ .250 HOSE SIZE /6/ .313 HOSE SIZE /6/ .375 HOSE SIZE /6/ .500 HOSE SIZE /6/ .625 HOSE SIZE /6/ .750
27、HOSE SIZE /6/ 1.000 HOSE SIZE /6/ 1.250 HOSE SIZE /6/ 1.500 - A B C E F G H J K L MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN .285 .234 .390 .320 .339 .260 .692 .487 .301 .248 .341 .278 .692 .487 .641 .537 .641 .450 .378 .320 .375 .267 .347 .304 .473 .393
28、409 .330 .692 .533 .375 .320 .411 .348 .692 .533 .641 .594 .641 .550 .430 .390 .445 .333 .417 .367 .524 .454 .472 .393 .780 .598 .438 .383 .474 .411 .780 .598 .704 .657 .704 .595 .499 .450 .508 .407 .500 .430 .620 .515 .535 .456 .840 .658 .507 .452 .547 .484 .840 .658 .766 .719 .766 .670 .559 .510
29、571 .470 .614 .546 .715 .645 .669 .590 .970 .778 .635 .578 .663 .600 .970 .778 .891 .844 .891 .775 .665 .625 .687 .586 .799 .641 .818 .748 .767 .681 1.090 .891 .749 .679 .769 .699 1.090 .891 1.016 .949 1.016 .875 .772 .726 .789 .681 .906 .766 .955 .870 .896 .810 1.220 1.016 .887 .811 .904 .834 1.22
30、0 1.016 1.141 1.074 1.141 .995 .887 .841 .914 .828 1.140 1.078 1.295 1.210 1.224 1.122 1.590 1.288 1.288 1.146 1.244 1.158 1.590 1.288 1.454 1.394 1.454 1.310 1.210 1.148 1.242 1.138 1.390 1.328 1.550 1.450 1.474 1.372 1.900 1.578 1.460 1.358 1.482 1.396 1.900 1.578 1.704 1.649 1.704 1.508 1.460 1.3
31、98 1.492 1.388 1.707 1.637 1.841 1.771 1.807 1.681 2.190 1.887 1.777 1.667 1.823 1.729 2.190 1.887 2.016 1.957 2.016 1.815 1.782 1.712 1.809 1.697 AEROSPACE STANDARD AS640 SHEET 5 OF 7 REV. A HOSE ASSEMBLY, POLYTETRAFLUOROETHYLENE, METAL BRAID, MEDIUM PRESSURE, FLARED, STRAIGHT TO STRAIGHT TABLE 5 -
32、 HOSE WEIGHT MAX - ALL OTHERS REF HOSE OR SLEEVE CODE OR FITTING FITTING TYPE /25/ UNITS HOSE SIZE .188 HOSE SIZE .250 HOSE SIZE .313 HOSE SIZE .375 HOSE SIZE .500 HOSE SIZE .625 HOSE SIZE .750 HOSE SIZE 1.000 HOSE SIZE 1.250 HOSE SIZE 1.500 - A B C E F G H J K L FIRESLEEVE CLAMP FITTING END A/D - C
33、RES B/E - AL C/F - TI R, S, E R, S, E R, S, E LB/IN LB/IN LB/IN LB/IN LB/IN LB/IN LB/IN LB/IN LB/IN LB/IN LB/IN LB/EA LB/EA LB/EA LB/EA .005 .003 .001 .009 .001 .002 .009 .016 .016 .006 .003 .015 .040 - .024 .007 .004 .001 .009 .002 .002 .009 .018 .017 .008 .004 .016 .055 .019 .033 .008 .004 .002 .0
34、11 .002 .002 .011 .020 .018 .009 .004 .018 .075 .026 .045 .010 .006 .002 .012 .002 .002 .012 .023 .021 .011 .005 .019 .085 .029 .051 .012 .007 .003 .017 .003 .003 .017 .030 .027 .015 .008 .021 .155 .053 .093 .016 .008 .004 .018 .004 .003 .018 .037 .035 .018 .009 .023 .235 .080 .141 .020 .010 .004 .0
35、28 .006 .005 .028 .045 .042 .023 .011 .025 .330 .112 .198 .045 .014 .005 .030 .007 .006 .030 .085 .079 .050 .018 .029 .535 .182 .321 .058 .020 .006 .040 .007 .006 .040 .107 .100 .063 .022 .033 .995 .338 .597 .074 .045 .009 .047 .008 .007 .047 .132 .123 .081 .028 .037 1.370 .466 .822 TABLE 6 - SLEEVE
36、 LENGTH HOSE SIZE LENGTH .188, .250, .313, .375 .500, .625 .750, 1.000 1.250, 1.500 2.00 .25 2.50 .25 3.00 .25 4.00 .25 TABLE 7 - INTEGRAL FIRE SLEEVE CUFF DIMENSIONS /26/ HOSE SIZE (REF) K MAX L MAX .250 .313 .375 .500 .625 .750 1.00 1.25 1.50 .90 .97 1.03 1.15 1.29 1.41 1.71 2.04 2.37 1.61 1.70 2.
37、18 2.50 2.67 2.67 3.10 2.80 2.95 AEROSPACE STANDARD AS640 SHEET 6 OF 7 REV. A HOSE ASSEMBLY, POLYTETRAFLUOROETHYLENE, METAL BRAID, MEDIUM PRESSURE, FLARED, STRAIGHT TO STRAIGHT NOTES: 1. CONSTRUCTION AND PERFORMANCE: AS1946, FITTINGS SHALL BE PERMANENTLY ATTACHED TO THE HOSE. 2. OPERATING CHARACTERI
38、STICS: SEE AS1946. 3. MATERIALS: a. HOSE AND FITTINGS - PER AS1946 /5/ b. SLEEVES - SEE APPLICABLE STANDARDS, TABLE 3 /4/ STANDARD COUPLING NUTS SHALL BE IN ACCORDANCE WITH AN818, AS1790, OR AS4370 (AS1791 WIRE AS APPLICABLE) AND MATE WITH AS4395 OR AS5309 FITTING ENDS. NONSTANDARD COUPLING NUTS MAY
39、 BE USED, PROVIDED THEY ARE FUNCTIONALLY EQUIVALENT, AND PROVIDED THEY CANNOT BE REMOVED FROM THE FITTING. NUTS SHALL MEET THE TORQUE TEST REQUIREMENTS PER AS1946. /5/ FOR THE ALUMINUM AND TITANIUM FITTINGS, THE BASIC MATERIALS ARE ALUMINUM AND TITANIUM BUT SOME OF THE COMPONENTS MAY BE STAINLESS ST
40、EEL. /6/ DIAMETERS ARE LISTED FOR CLAMP SELECTION. TUBULAR SLEEVES MAY NOT BE A PERFECT ROUND AND SHALL BE MEASURED WITH A DIAMETER MEASUREMENT TAPE. /7/ THE INSTALLED TUBULAR ABRASION SLEEVES AXIAL MOVEMENT ON THE HOSE SHALL NOT EXCEED .05 in. ENDS OF THE TUBULAR SLEEVE SHALL BE TERMINATED WITH A L
41、ENGTH OF AMS-DTL-23053/11 (FEP) CLASS 1 OR 2, COLOR CLEAR, PER TABLE 6 AND FIGURE 2. /8/ COIL ABRASION SLEEVES, WHEN ASSEMBLED ON A STRAIGHT HOSE, SHALL HAVE AN AVERAGE GAP BETWEEN COILS NOT EXCEEDING .05 in. DISPLACEMENT OF THE COILS OF THE SLEEVE, CAUSING A GREATER GAP, SHALL NOT BE CAUSE FOR REJE
42、CTION IF THE COILS CAN BE REPOSITIONED TO MEET THE GAP REQUIREMENTS. ENDS OF THE COIL SLEEVE SHALL BE TERMINATED WITH A LENGTH OF HEAT SHRINKABLE SLEEVING IN ACCORDANCE WITH TABLE 6 AND FIGURE 2. CODE “B“ (NYLON COIL) ABRASION SLEEVES SHALL BE TERMINATED WITH AMS-DTL-23053/5 CLASS 1 OR 3, COLOR BLAC
43、K. CODE “L“ (COIL ABRASION) SLEEVES SHALL BE TERMINATED WITH AMS-DTL-23053/12, CLASS 1, COLOR TRANSPARENT, PTFE. (OPTIONAL FOR BOTH SLEEVES AMS-DTL-23053/11 (FEP) CLASS 1 OR 2, COLOR CLEAR). /9/ THE TABLE 4 SLEEVE DIAMETERS FOR AS1072 SLEEVES APPLY WHEN THE SLEEVE IS COMPRESSED, OR CLAMPED, TO CONTA
44、CT THE HOSE. IN THIS CASE, A WRINKLE MAY OCCUR OVER APPROXIMATELY 10% OF THE SLEEVE CIRCUMFERENCE. /10/ THE CUT ENDS OF THE FIRE SLEEVE SHALL BE SEALED USING RTV SILICONE RUBBER, PRIOR TO INSTALLATION, TO PREVENT WICKING OF FLUIDS. THE FIRE SLEEVE ENDS SHALL BE SECURED TO THE HOSE ASSEMBLY END FITTI
45、NGS WITH CORROSION RESISTANT STEEL BANDS. AFTER INSTALLATION, CRACKS OR VOIDS IN THE FIRE SLEEVE, WHICH EXPOSE THE FIBERGLASS, SHALL BE COATED WITH SILICONE RUBBER. /11/ INTEGRAL ABRASION SLEEVE SHALL FORM AN INTEGRAL, PERMANENT PART OF THE HOSE AND SHALL TERMINATE A MAXIMUM OF .250 FROM THE END OF
46、THE COLLAR. /12/ FEP AND POLYOLEFIN SHRINK ABRASION SLEEVES SHALL BE SHRUNK TO A SNUG FIT OVER THE HOSE AND END FITTING COLLARS. SLEEVE SHALL COVER A MINIMUM OF ONE HALF THE COLLAR. /13/ ADD “AS1055 TYPE IIb CLASS A-S/P“ OR “AS150 TYPE VIIbA” TO IDENTIFICATION MARKING TO SHOW LEVEL OF COMPLIANCE, “F
47、IRE RESISTANT (5 min), WITH AS1055 OR AS150“. SEE AS150 OR AS1055 FOR FURTHER CLARIFICATION AND MARKING REQUIREMENTS. /14/ ADD “AS1055 TYPE IIb CLASS B-S/P“ TO IDENTIFICATION MARKING TO SHOW LEVEL OF COMPLIANCE, “FIRE PROOF (15 min), WITH AS1055“. SEE AS150 OR AS1055 FOR FURTHER CLARIFICATION AND MA
48、RKING REQUIREMENTS. /15/ PRODUCT SUPPLIED TO THIS SPECIFICATION SHALL BE MANUFACTURED AND ASSEMBLED BY AN ACCREDITED MANUFACTURER OR ASSEMBLED BY AN ACCREDITED ASSEMBLING DISTRIBUTOR LISTED IN THE PERFORMANCE REVIEW INSTITUE (PRI) QUALIFIED PRODUCT LIST FOR PRI-QPL-AS1946 FOR THIS STANDARD. SEE http
49、/ FOR CURRENT QPL ONLINE. /16/ A TRUE CIRCULAR CROSS SECTION IS NOT REQUIRED THROUGH THE FITTING ID. HOWEVER, THE APPLICABLE MINIMUM BALL DIAMETER LISTED IN TABLE 1 MUST BE CAPABLE OF PASSING THROUGH THE HOSE ASSEMBLY. /17/ DISTANCE ACROSS CORNERS OF THE HEX MAY EXCEED THIS DIMENSION. AEROSPACE STANDARD AS640 SHEET 7 OF 7 REV. A HOSE ASSEMBLY, POLYTETRAFLUOROETHYLENE, METAL BRAID, MEDIUM PRESSURE, FLARED, STRAIGHT TO STRAIGHT 18/ MARKING: MARKING SHALL BE PER AS1946 ON A STAINLESS STEEL BAND NOT OVER 1.0 in WIDE OR ON THE COLLAR. THE CHARACTERS SHAL
copyright@ 2008-2019 麦多课文库（www.mydoc123.com）网站版权所有
备案/许可证编号：苏ICP备17064731号-1