第 4 章 空调风管道系统设计
DESCRIPTION
第 4 章 空调风管道系统设计. 主要内容. 4.1 空调风管道 4.1.1 空调风管道种类 4.1.2 空调风管的形状与规格尺寸 4.1.3 空调风管阻力与减阻措施 4.2 空调风系统设计 4.2.1 空调风管系统的设计原则 4.2.2 空调风管系统的设计步骤 4.2.3 空调风管系统的阻力计算 4.2.4 空调风管系统设计中应注意的 几个问题. 4.3 均匀送风管设计 4.3.1 风口送风原理 4.3.2 实现均匀送风的基本条件 4.3.3 均匀送风管道的设计与计算 4.4 空调风管和设备的绝热 - PowerPoint PPT PresentationTRANSCRIPT
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4
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4.1 4.1.1 4.1.2 4.1.3 4.2 4.2.1 4.2.2 4.2.3 4.2.4
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4.3 4.3.1 4.3.2 4.3.3 4.4 4.4.1 4.4.2 4.4.3 4.5 4.5.1 4.5.2 4.5.3
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4.1 ()
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4.1.1 ()() ()() () ()
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4.1.1 1.
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4.1.1 2. (1)
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()
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(2)
()
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4.1.1 +++()+ 3.
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(1)T
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1) 2) 3)1/3 4)
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0.2mm
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(2)
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1/4()
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(3)
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4. ()
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(1)()() 61
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lOm1m2m
()
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(2)
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6-2
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(3)()
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4.1.2
1.
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(1) 1.03.513%36%16%45%
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(2)
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(3)63
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4.1.2 2. (GB 502432002)6-16-2
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41
81118160%41110
120
200
320
500
800
1250
2000
3000
4000
160
250
400
630
1000
1600
2500
3500
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4.1.2 6-2 mm
D
100
80
90
250
240
560
530
1120
1060
120
110
280
260
630
600
1250
1180
140
130
320
300
700
670
1400
1320
160
150
360
340
800
750
1600
1500
180
170
400
380
900
850
1800
1700
200
190
450
420
1000
950
2000
1900
220
210
500
480
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4.1.2 1015 6-3 mm
D
b
D(b)(320
05
05
075
320D(b)(450
06
06
075
450D(b)(630
075
06
075
630D(b)(1000
075
075
10
1000D(b)(1250
10
10
10
1250D(b)(2000
12
10
12
2000D(b)(4000
12
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4.1.3 () 1.
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4.1.3 2.()80%()
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1),RRR/b=1.02.0(b)R/b1.02)()()30
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90()3)3015
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4)ld(ld)
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4.2
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4.2.1 (1) (2) (3)
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4.2.1 (4)() (5)
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4.2.1 (GB 50019-2003)9.1.56-46-5
6-4 ( m/s) 810 m/s
dBA
2535
34
2
3550
47
23
5065
69
35
6585
812
58
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4.2.1 6-5 1.80% 2.50%
NR
/(m/s)
/(m/s)
45
17.8
25.4
35
12.7
17.8
25
8.6
12.7
45
12.7
22.9
35
8.9
15.2
25
6.1
10.2
45
10.2
19.8
35
7.4
13.2
25
4.8
8.6
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4.2.1 (6)10% -15%10%
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4.2.2 1) 2) 3) 4) 5)() 6) 7)
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4.2.3 1.
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(1) (2)
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(3)6-4
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1-1v12-2v2(v1v2 )pq1=pq2 , pj2pj1,2-21-1(AB)6-4
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1-12-2 (6-1)
Z1-2 Pa
1-2
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(6-1)
(6-2)
6-3 Kl
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(6-2)(6-3) (6-4) Kv1v21-21-2v1v2Kv1v2K,K0.5K 0.5
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K,KK0.75(6-3)v1pjpj
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2. 1) 2)()
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3)()6-4 6-16-2abd vDv4)6-5Rmpm=lRm BZ= p=pm+Z
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5)15%15%
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()
6)
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4.2.3 6-1 K=0.15mm1080m3/h295Pa
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1.2.3.6-6 6-1A B C D E F G
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4. (1)1-2()6-44m/s1080m3/h
6-1F320250mm
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(2)2-34m/s2160m3/hF=0.15m2500320mmv=3.75m/sD=390mm
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(3)3-4645.5m/s3240m3/hF=0.163m2500320mmv=5.6m/sD=390mm (4)5-6 34 (5)7-2 1-2 (6)8-3 1-2
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4.2.3 5. (1)1-2(9m) 1) 3.75m/s281mm6-5Rm=0.71Pa/m12
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6-5
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2) 1080m3/h0.88.3.22m/s5m/s3m/s
500250mm
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B7=3.5
320250mm500250mm F1/F2=320250/500250=0.64B1130o=0.76(123.75m/s)
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90o b/h=250/320=0.78R/b=1B27=0.28 OoB16=0.83 90o b/h=320/250=1.28R/b=1B27=0.3 500320mm250320mmB23=0.1(45 o)
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qv2/qv= 1080/2160=0.5F2/F=320250/500320=0.5B34=0.12(3.75m/s)
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4.2.3 12
12
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(2)23(5m) 1) 3.75m/s390mm65Rm= 0.49Pa/m
2) F1/F=500320/500320=1B35=0.247()
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(3)34(8m) 1) 5.6m/s390mm6-5Rm= 1Pa/m
2) 90o b/h=500/320=1.56R/b=1B27=0.31 0oB16=0.83
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34 34
(4)45 p4-5=295Pa()
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(5)56(6m) 1) v=5.6m/sD=390mm6-5Rm= 1Pa/mpm5-6=61Pa=6Pa 2) 3240m3/h0.8F0/F1 =0.88-12.5m/s
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500900mm
B6=0.9
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500mm900mm500mm320mmB23=0.1(45o565.6m/s) 90o b/h=500/320= 1.56R/b=1B271=0.31b/h=320/500=0.64R/b=1B272=0.27= 0.58
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() f/F0.5B20=0.25(565.6m/s)
56
56
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(6)72(3m) 1) 1-2v=3.75m/sD=281mmRm =0.71Pa/m
2) 12 Z1=12.1Pa =0.76(3.75m/s)90o =0.28 =0.83
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L2/L=1080/2160=0.5F2/F=320250/500320=0.5B34=0.5(3.75m/s)
7-2
7-2
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(7)83(13m) 1) 1-2v=3.75m/sD=281mmRm=0.71Pa/mpm8-3=130.71Pa= 9.23Pa 2) 1-2 Z1=12.1Pa =0.76(3.75m/s) 90o =0.28 =0.83 90o =0.3 Z6=0.21Pa
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23Z7=4.65Pa 8-3
8-3
6667
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6. (1)1-27-21-2p1-2=38.02Pa72p7-2=34.23Pa 15% 7-2
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(2)1-2-38-31-2-3p1-2-3 = 38.02Pa+7.1Pa =45.12Pa83p8-3=44.5Pa
15%
7.123456
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15%
3240m3/h10%
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4.2.4 1)6-7
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6-86-8 a) b)
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2)1.52.5
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3)
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4)2m1m
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4.3 1)(6-10)2)(6-11)3)
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4.3.1 1. 6-5
pj(Pj )Pa
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6-6
PdPa6-9 6-7
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2.()
(6-8)
(6-9) 69
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3.qV0
(6-10) F m26-9f
(6-11)
f0m2
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6-116-10
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4.3.2 (qV0)f0pj
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610
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4.3.3 62 8000m3/h6-1381.5m ? (0.6) 6-13 6-2
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1)8.3.24.5m/s
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2)vj/vd1.73
6-45065db(A)1vd1=4m/s
1
1
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3)1-2qV1-2=7000m3/hD1=840mm(D1D2D21-2)6-5Rm1-2=0.17 Pa/m6-8
qV0/qV
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0.15
0.05
0.02
0.01
0.03
0.07
0.12
0.17
0.23
0.29
0.35
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6-81=0.04
1-2
2
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4)2 2
2602
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34 34143.35Pa
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4.3.3 69614614
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4.4
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4.4 1)2)3)4)
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4.4 ()()
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4.4.1 ()1000mm1000mm
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1.()()
(613)
(614)
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mA1A1= 1.89710-3(A1=10-3)A2A2= 3.79510-3(A2=210-3)fn/106kJ W/(mK)h8000h |t| pi/m3
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S %i %(6%10%)n 46 510S W/(m2K)S=8.14W/(m2K) S=11.63 W/(m2K)D0 m
20mm25mm30mm40mm50mm60mm
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2.()
(6-15)
(6-16a)
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mtjtS=tL+(1 3)tLta t ta
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(616a) (x2.3) (616b)
(x2.3) (616c)
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4.4.1 63 ta=30a=85%tL=26.4187=0.04 W/(mK)S=8.14 W/(m2K) D0=108mm
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1)(63)
0.02m20mm2)(64a)
0.03m30 mm
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(6-13)-(6-16)6-96-106-11
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4-9 (5) ( mm
DN1525
13
DN1525
19
DN1540
DN50
20
25
DN1540
20
DN3280
15
DN3280
22
DN50150
25
DN100
19
DN100
25
DN200
30
DN1550
19
DN1540
25
DN1540
DN50
25
30
DN1540
25
DN6580
22
DN5080
28
DN50150
30
DN100
25
DN100
32
DN200
35
DN1525
25
DN1532
32
DN1540
DN50
30
35
DN1540
30
DN3280
28
DN4080
36
DN50150
35
DN100
32
DN100
40
DN200
40
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4-10 ( mm4-11 ( mm
6
9
10
10
9
13
10
15
14
30
40
13
19
20
30
9
13
4
40
50
19
25
30
40
15
21
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4.4.2 0.2 W/(mK) 270.042W/(mK)3500.12W/(mK)
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4.4.2 (= 6080kg/m3) (= 80350kg/m3)
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1. (1) 1)110
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2)50%98%
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3)
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(2) 1)
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2) (3)()
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1) 2)()()()()1()()
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(4)(GB 502221995)(A)(B)(B1) (B2) (B3) (5)
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2.() (1)()()()()100150()
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() () () (2)
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()
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(3)
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(EPS)
(B2)80
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(4)(LDPF)B1
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(5)(NR)
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(5) B1
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(6)
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(6) (PVC)B1
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(7)
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(8)
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(9) (10)
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3. 1)0.0250.15W/(mK)2)
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3) 4)5)6).7)8)9)
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6.4.3
1.
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()() 20mm
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2. 1) + + ()
2) + ()
3) + + () ()
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3. + + () ()
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6.5
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4.5.1 1.
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2. ()
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(500mm), 615
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616
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617
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6.5.2 ()()
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4.5.2 1.5
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4.5.2 6-18
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2.1)2) 3.1)2)3)4)5)(6-19)
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4.5.2 6-19
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4.5.3 1. 70 6-20
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4.5.2 0o90o 620
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2.6-21
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4.5.3
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60-22
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1 2 3
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4(GB502432002) 5 6)(GB500192003)9.1.5
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7) 8) 9)
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10)() 11) 12)
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13) 14) 15)