版權(quán)說(shuō)明:本文檔由用戶提供并上傳,收益歸屬內(nèi)容提供方,若內(nèi)容存在侵權(quán),請(qǐng)進(jìn)行舉報(bào)或認(rèn)領(lǐng)
文檔簡(jiǎn)介
APA4863
CopyrightANPECElectronicsCorp.
Rev.A.3-Apr.,2001
PAGE
10
Stereo2.2WAudioPowerAmplifier
Features
DepopCircuitryIntegrated
ThermalShutdownCircuitryIntegrated
Bridge-TiedLoad(BTL)orSingle-Ended(SE)ModesOperation
DD
OutputPowerat1%THD+N,V=5V
2.2W/Ch(typ)intoa3Load
1.8W/Ch(typ)intoa4Load
1.2W/Ch(typ)intoa8Load
SD
ShutdownControlMode,I=0.5μA
DD
OutputPower(SE)at0.5%THD+N,V=5V
90mW/Ch(typ.)intoa32Load
VariousPowerPackagesAvailableSOP,TSSOP,TSSOP-P
Applications
StereoAudioPowerAmplifierforNotebookComputer
Portable evisions
PortableandDesktopComputers
GeneralDescription
TheAPA4863isastereobridge-tiedaudiopoweram-plifierinvariouspowerpackages,includingSOP,TSSOPandTSSOP-P.Whenconnectingtoa5Vvolt-agesupply,theAPA4863iscapableofdelivering2.2W/1.8W/1.2WofcontinuousRMSpowerperchan-nelinto348bridge-tiedloadswithlessthan1%THD+Nrespectively.WhenAPA4863operatesinthesingle-endedload,itiscapableofdelivering90mWofcontinuousRMSpowerperchannelinto32load.TheAPA4863simplifiesdesignandsupboardspaceforotherfeatures.
TheAPA4863alsoservedwellinlow-voltageappli-cations,whichprovides750mW(1%THD+N)perchannelinto4loadswitha3.3Vsupplyvoltage.BothofthedepopcircuitryandthethermalshutdownprotectioncircuitryareintegratedintheAPA4863,thatreducespopsandclicksnoiseduringpowerupandwhenusingtheshutdownmodeandprotectsthechipfrombeingdestroyedbyover-temperaturefail-ure.Tosimplifytheaudiosystemdesigninnote-bookcompupplications,theAPA4863combinesastereobridge-tiedloadsmodeforspeakerdriveandastereosingle-endmodeforheadphonedriveintoasinglechip,wherebothmodesareeasilyswitchedbytheHP-INinputcontrolpinsignal.Forpowersen-sitiveapplications,theAPA4863alsofeaturesashut-downfunctionwhichkeepsthesupplycurrentonly
0.5μA(typ.).
OrderingandMarkingInformation
APA4863
PackageCode
:SOP O:TSSOP R:TSSOP-P*
Temp.Range
I:-40to85C
HandlingCode
TU:Tube TR:Tape&Reel TY:TrayLeadCode
:LeadDevice Blank:OriginalDevice
LeadCode
HandlingCode
Temp.Range
PackageCode
APA4863K:
APA4863XXXXX
XXXXX-
APA4863R/O:
APA4863
XXXXX
XXXXX-
*TSSOP-PisastandardTSSOPpackagewithathermalpadexposedonthebottomofthepackage.
ANPECreservestherighttomakechangestoimprovereliabilityormanufacturabilitywithoutnotice,andadvisecustomerstoobtainthelatestversionofrelevantinformationtoverifybeforecingorders.
BlockDiagram
AudioInput
RF
R1 20K 6
CS
-INA
0.1F
VDD
4,13
CO
+
100F
1K
R
Control
Pin Ring
L
8
ToHP-INCircuit
CO
+
100F
TipSleeve
HeadphoneJack
R
1K
L
8
-OUTA
C1
1F
20K
8+INA*
Bypass
5
20K
5
20K
20K
C V
10
B
DD/2
+OUTA
3
AudioInput
2.2F
R
50K
C1
1FVDD
1
ToControlPinon
1
20K
11
9
RF
20K
1
16
-INB
+INB*
ShutdownHP-IN
20K
-OUTB1220K
20K
+OUTB
14
HeadphoneJack
100K
GND27,15
*+INAand+INBpinsareconnectedtoBypasspininsidetheIC.
AbsoluteumRatings
(Overoperating-airtemperaturerangeunlessotherwisenoted.)
Symbol
Parameter
Rating
Unit
VDD
SupplyVoltage
6
V
TA
OperatingAmbientTemperatureRange
-40to85
C
TJ
umJunctionTemperature
150
C
TSTG
StorageTemperatureRange
-65to+150
C
TS
SolderingTemperature,10seconds
260
C
VESD
ElectrostaticDischarge
-2000to2000*1
V
Note:*1.Humanbodymodel:C=100pF,R=1500,3positivepulsesplus3negativepulses
RecommendedOperatingConditions
Min.
Typ.
Max.
Unit
SupplyVoltage,VDD
3
5
5.5
V
Operating-airtemperature,TA
VDD=5V, 4-stereoBTLdrive,with250mW/Chaverage properPCBdesign
power
VDD=5V, 4-stereoBTLdrive,with
1.8W/Chaverage properPCBdesignand300power CFM d-aircooling
-20
-20
85
85
C
monmodeinputvoltage,VICM
=5V
1.25
4.5
V
VDD=3.3V
1.25
2.7
DissipationRatingTable
Package
AirFlow(CFM)
Thermal
JA(C/W)
TA25C
TA=70C
SO16+
0
50
2.5W
1.6W
TSSOP++
0
200
73.2
66.6
1.7W
1.8W
1.1W
1.2W
TSSOP-P++
0
200
37.6
32.3
3.3W
3.8W
2.1W
2.4W
+:Theparameterismeasuredwiththe mendedcopperheatsinkpatternonan2-layerPCB,11.7in23.02.4in2i B,1oz.copper,3.01.5in2incoverageatToyerandBottom-layerat100%coverage(7.2in2).
++:TheparameterismeasuredwiththeJEDECstandardtestboards(multi-layerPCB).
ElecticalCharacteristics
ElectricalCharacteristicsforEntireIC
ThefollowingspecificationsapplyforVDD=5Vunlessotherwisenoted.LimitsapplyforTA=25°C
Symbol
Parameter
TestConditions
APA4863
Unit
Min.
Typ.
Max.
VDD
SupplyVoltage
3
5.5
V
IDD
QuiescentPowerSupply
Current
VIN=0V,IO=0A,HP-IN=0V
VIN=0V,IO=0A,HP-IN=4V
9
5
13.5
7.5
mA
ISD
ShutdownCurrent
VPIN1=VDD
5
0.5
A
VIH
HeadphoneHighInputVoltage
4
V
VIL
HeadphoneLowInputVoltage
0.8
V
ElecticalCharacteristicsCont.
ElectricalCharacteristicsforBTLModeOperation
ThefollowingspecificationsapplyforVDD=5Vunlessotherwisenoted.LimitsapplyforTA=25°C
Symbol
Parameter
TestConditions
APA4863
Unit
Typ.
VOS
OutputOffsetVoltage
VIN=0V
5
mV
PO
OutputPower
THD=1%,f=1kHz
RL=3
2.2
W
RL=4RL=8
1.8
1.2
THD=10%,f=1kHz
RL=3
2.7
RL=4
RL=8
2.3
1.5
THD+N
TotalHarmonicDistortion+Noise
AVD=2,f=1kHz
RL=4,PO=1.8W
0.3
%
RL=8,PO=1W
0.15
RSRR
PowerSupplyRejectionRatio
VDD=5V,VRIPPLE=200MvRms,RL=8CB=2.2F
64
dB
XTALK
ChannelSeparation
f=1kHz,CB=2.2F,PO=1W,RL=8
90
dB
SNR
Signal-to-NoiseRatio
VDD=5V,PO=1.1W,RL=8
95
dB
ElectricalCharacteristicsforSEModeOperation
ThefollowingspecificationsapplyforVDD=5Vunlessotherwisenoted.LimitsapplyforTA=25°C
Symbol
Parameter
TestConditions
APA4863
Unit
Typ.
VOS
OutputOffsetVoltage
VIN=0V
5
mV
PO
OutputPower
THD=0.5%, f=1kHz,RL=32
THD=1%, f=1kHz,RL=8THD=10%, f=1kHz,RL=8
90
320
400
mW
THD+N
TotalHarmonicDistortionplusNoise
AV=-1,PO=75mW,f=1kHz,RL=32
0.02
%
RSRR
PowerSupplyRejectionRatio
VRIPPLE=200mVRMS,f=1kHz,CB=2.2F,RL=8
49
dB
XTALK
ChannelSeparation
f=1kHz,CB=2.2F,PO=32mW,RL=32
85
dB
SNR
Signal-to-NoiseRatio
VDD=5V,PO=340mW,RL=8
95
dB
TruthTableforLogicInputs
Shutdown
HP-IN
APA4863Mode
Low
Low
Bridge-Tied
Low
High
Single-Ended
High
Low
APA4863Shutdown
High
High
APA4863Shutdown
PinDescription
SHUTDOWN
GND
+OUTA
VDD
-OUTA
-INAGND
+INA
HP-INGND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SHUTDOWN
1
20
HP-IN
GND
2
19
GND
+OUTA
3
18
+OUTB
V
4
17
VDD
-OUTA
-INA
5
6
16
15
OUTB
INB
GND
7
14
BYPASS
+INA
8
13
+INB
NC
9
12
NC
NC
10
11
NC
TopView
forTSSOP
+OUTB
V
DD
DD
OUTB
INB
BYPASS
+INB
TopViewforSOP
SHUTDOWN
1
20
HP-IN
GND
2
19
GND
+OUTA
3
18
+OUTB
VDD
4
17
VDD
-OUTA
5
16
-OUTB
-INA
6
15
-INB
GND
7
14
BYPASS
+INA
8
13
+INB
GND
9
12
GND
GND
10
11
GND
ThermalPad
TopView
forTSSOP-P
PinDescription
BottomViewforTSSOP-P
Name
I/O
Description
GND
Groundconnectionofcircuitry
VDD
I
Supplyvoltageinput
+INA
I
Non-invertinginputofchannelA,connectedtobypasspininsidetheIC
-INA
I
InputpinofchannelA
+OUTA
O
Achannel+outputinBTLmode,highimpedanceinSEmode
-OUTA
O
Achannel-outputinBTLmode,+outputinSEmode
+INB
I
Non-invertinginputofchannelB,connectedtobypasspininsidetheIC
-INB
I
InputpinofchannelB
+OUTB
O
Bchannel+outputinBTLmode,highimpedanceinSEmode
-OUTB
O
Bchannel-outputinBTLmode,+outputinSEmode
BYPASS
Connecttovoltagedividerforinternalmid-supplybias
HP-IN
I
Headphonecontrolpininput,holdhighforsingle-endedmodeoperation
SHUTDOWN
I
Shutdownmodecontrolpininput,cesentireICinshutdownmode
whenheldhigh,IDD=0.5A
TypicalCharacteristics
THD+NvsOutputPower
VDD=5V,RL=4BW<80kHz
20Hz
20kHz1kHz
10
THD+NvsFrequency
VDD=5V,PO=1.8WRL=4BW<80kHz
10
1
THD+N(%)
THD+N(%)
1
0.1
0.1
0.01
10m
100m 1 3
0.01
20
100
1k 10k20k
Figure1:OutputPower(W) Figure2:Frequency(Hz)
PowerDissipationvsOutputPower
VDD=5V
RL=4
RL=8
1.4
PowerDissipation(W)
1.2
1
0.8
0.6
0.4
10
THD+N(%)
1
0.1
THD+NvsFrequency
0.2
0
0 0.5 1 1.5 2 2.5
0.01
VDD=5V,PO=1W
RL=8BTLMode
AVD=10
AVD=2
20
100 1k
10k20k
Figure3:OutputPower(W) Figure4:Frequency(Hz)
TypicalCharacteristicsCont.
THD+NvsFrequency
VDD=5V,PO=150mW
RL=16SEMode
AV=-5
AV=-1
10
THD+NvsFrequency
VDD=5V,PO=75mW
RL=32SEMode
AV=-5
AV=-1
10
1 1
THD+N(%)
THD+N(%)
0.1 0.1
0.001
20
100 1k
10k
20k
0.001
20
100 1k 10k20k
Figure5:Frequency(Hz) Figure6:Frequency(Hz)
THD+NvsOutputPower
f=20Hz
f=20kHz
f=1kHz
VDD=5V,RL=8
AVD=2,BW<80kHz
BTLMode
10
THD+NvsOutputPower
10
THD+N(%)
1
0.1
1
THD+N(%)
0.1
f=20kHzf=20Hz
f=1kHz
VDD=5V,RL=16
0.01
10m
100m 1 2
0.001
10m
AV=-1,BW<80kHz
SEMode
70m 200m 500m
Figure7:OutputPower(W) Figure8:OutputPower(W)
TypicalCharacteristicsCont.
10
THD+N(%)
1
0.1
0.001
THD+NvsOutputPower
VDD=5V,RL=32
AV=-1,BW<80kHz
SEMode
f=20kHzf=20Hz
f=1kHz
10
THD+N(%)
1
0.1
0.01
THD+NvsOutputPower
f=20kHz
f=20Hz
f=1kHz
VDD=3.3V,RL=4AVD=2
10m
50m
100m
200m
10m
100m 1 2
Figure9:OutputPower(W) Figure10:OutputPower(W)
THD+NvsFrequency THD+NvsOutputPower
f=20kHz
f=20Hz
f=1kHz
VDD=3.3V,RL=8,AVD=2
VDD=3.3V,PO=700mWRL=4,AVD=2
10 10
1 1
THD+N(%)
THD+N(%)
0.1 0.1
0.01
20
100 1k 10k
20k
0.01
10m
100m 1
Figure11:Frequency(Hz) Figure12:OutputPower(W)
TypicalCharacteristicsCont.
THD+NvsFrequency
10
VDD=3.3V,PO=450mWRL=8,AVD=2
1
OutputPowervsLoad
VDD=3.3V,f=1kHzAVD=2,BW<80kHz
THD+N=10%
THD+N=1%
0.2
0.15
THD+N(%)
OutputPower(W)
0.1
0.1
0.05
0.01
20
100
1k 10k
20k
0
0 10 20 30 40
Figure13:Frequency(Hz) Figure14:Load ()
PowerDissipationvsOutputPower OutputPowervsSupplyVoltage
0.35
0.3
PowerDissipation(W)
0.25
0.2
0.15
0.1
0.05
0
RL=8
RL=16
VDD=3.3V,SEMode
0 0.2 0.4 0.6 0.8
2
VDD=5V,f=1kHz
RL=8BW<80kHz
BTLMode
THD+N=10%
THD+N=1%
1.75
OutputPower(W)
1.5
1.25
1
0.75
0.5
0.25
02
2.5 3 3.5 4
4.5 5 5.5
Figure15:OutputPower(W) Figure16:SupplyVoltage(V)
TypicalCharacteristicsCont.
300
250
OutputPower
200
150
100
50
OutputPowervsSupplyVoltage
VDD=5V,f=1kHz
RL=16BW<80kHz
SEMode
THD+N=10%
THD+N=1%
150
130
OutputPower
110
90
70
50
30
10
OutputPowervsSupplyVoltage
02 2.5 3 3.5 4 4.5 5 5.5
SupplyVoltage(V)Figure17
-10
VDD=5V,f=1kHz
RL=32BW<80kHz
SEMode
THD+N=10%
THD+N=1%
2 2.5 3 3.5 4 4.5 5 5.5
SupplyVoltage(V)Figure18
OutputPowervsLoad OutputPowervsLoad
VDD=5V,f=1kHz
AVD=2BW<80kHz
BTLMode
10%THD+N
1%THD+N
1.75
1.5
OutputPower(W)
1.25
1
0.75
0.5
0.25
0
1
VDD=5V,f=1kHz
AV=-1BW<80kHz
SEMode
10%THD+N
1%THD+N
OutputPower(W)
0.8
0.6
0.4
0.2
8 18 28 38 48 58 68
00 1020 30 40 50 60 70
Figure19:Load () Figure20:Load ()
TypicalCharacteristicsCont.
PowerDissipationvsOutputPower
RL=4
R=8
VDD=5V,f=1kHzTHD+N<1%
BW<80kHz
BTLMode
L
RL=16
RL=32
1.4
1.2
PowerDissipation
1
0.8
0.6
0.4
0.2
0
0 0.5 1 1.5
OutputPower(W)Figure21
0.18
0.16
PowerDissipation
0.14
0.12
0.1
0.08
0.06
0.04
0.02
0
PowerDissipationvsOutputPower
RL=8
RL=32 VDD=5V,f=1kHz
THD+N<1%
BW<80kHz
SEMode
RL=16
0 0.1 0.2 0.3 0.4 0.5
OutputPower(W)Figure22
OutputNoiseVoltage(V)
100
10
NoiseFloor
+0
ChannelSeparation(dB)
-20
-40
-60
ChannelSeparation
VO++VO-
VO-
VDD=5V,RL=8AVD=2,CB=1F
1
20 100
1k 10k20k
-80
VDD=5V,RL=8AVD=2,PO=1WCB=1F
BTLMode
ChannelAtoB
ChannelBtoA
-100
-120
20
100 1k 10k20k
Figure23:Frequency(Hz) Figure24:Frequency(Hz)
TypicalCharacteristicsCont.
ChannelSeparation
OpenLoopFrequencyResponse
VDD=5V,RL=32AV=-1,PO=75mWCB=1F
SEMode
ChannelAtoB
ChannelBtoA
+80
+70
+60
+50
+40
+30
+20
+10
VDD=5V
SEMode
Gain
Phase
+0
100 1k 10k 100k 1M 10M
(dB)
-20
ChannelSeparation
-40
Gain(dB)
-60
-80
-120
20
100
1k 10k20k
Figure25:Frequency(Hz) Figure26:Frequency(Hz)
SupplyCurrentvsSupplyVoltage
VIN=0V
NoLoad
BTLMode
(H ND)
SEMode
(HP-IN=VDD)
10
8
SupplyCurrent(mA)
6
4
2
02 2.5 3 3.5 4 4.5 5 5.5
Figure27:SupplyVoltage(V)
PackagingInformation
SO–300mil(ReferenceJEDECRegistrationMS-013)
D
N
H
E
GAUGE
NE
L
1
123
A
e
B
A1
Dim
Millimeters
Variations-D
Dim
Inches
Variations-D
Min.
Max.
Variations
Min.
Max.
Min.
Max.
Variations
Min.
Max.
A
2.35
2.65
SO-16
10.10
10.50
A
0.093
0.1043
SO-16
0.398
0.413
A1
0.10
0.30
SO-18
11.35
11.76
A1
0.004
0.0120
SO-18
0.447
0.463
B
0.33
0.51
SO-20
12.60
13
B
0.013
0.020
SO-20
0.496
0.512
D
Seevariations
SO-24
15.20
15.60
D
Seevariations
SO-24
0.599
0.614
E
7.40
7.60
SO-28
17.70
18.11
E
0.2914
0.2992
SO-28
0.697
0.713
e
1.27BSC
SO-14
8.80
9.20
e
0.050BSC
SO-14
0.347
0.362
H
10
10.65
H
0.394
0.419
L
0.40
1.27
L
0.016
0.050
N
Seevariations
N
Seevariations
1
0
8
1
0
8
APA4863
CopyrightANPECElectronicsCorp.
Rev.A.3-Apr.,2001
PAGE
14
PackagingInformation
TSSOP/TSSOP-P(ReferenceJEDECRegistrationMO-153)
e
N
2xE/2
E1 E
123
e/2
D
A2
A
b
A1
(2)
GAUGE
NE
S
0.25
L
(L1)
1
(3)
D1
EXPOSEDTHERMAL
PADZONE
E2
BOTTOMVIEW
(THERMALLYENHANCEDVARIATIONDSONLY)
Dim
Millimeters
Inches
Min.
Max.
Min.
Max.
A
1.2
0.047
A1
0.00
0.15
0.000
0.006
A2
0.80
1.05
0.031
0.041
D
6.4(N=20PIN)
7.7(N=24PIN)
9.6(N=28PIN)
6.6(N=20PIN)
7.9(N=24PIN)
9.8(N=28PIN)
0.252(N=20PIN)
0.303(N=24PIN)
0.378(N=28PIN)
0.260(N=20PIN)
0.311(N=24PIN)
0.386(N=28PIN)
D1
4.2BSC(N=20PIN)
4.7BSC(N=24PIN)
3.8BSC(N=28PIN)
0.165BSC(N=20PIN)
0.188BSC(N=24PIN)
0.150BSC(N=28PIN)
e
0.65BSC
0.026BSC
E
6.40BSC
0.252BSC
E1
4.30
4.50
0.169
0.177
E2
3.0BSC(N=20PIN)
3.2BSC(N=24PIN)
2.8BSC(N=28PIN)
0.118BSC(N=20PIN)
0.127BSC(N=24PIN)
0.110BSC(N=28PIN)
L
0.45
0.75
0.018
0.030
L1
1.0REF
0.039REF
R
0.09
0.004
R1
0.09
0.004
S
0.2
0.008
1
0
8
0
8
2
12REF
12REF
3
12REF
12REF
APA4863
CopyrightANPECElectronicsCorp.
Rev.A.3-Apr.,2001
PAGE
15
PhysicalSpecifications
TerminalMaterial
Solder- tedCopper(SolderMaterial:90/10or63/37SnPb),100%Sn
LeadSolderability
MeetsEIASpecificationRSI86-91,ANSI/J-STD-002Category3.
Packaging
1000devicesperreel
ReflowCondition(IR/ConvectionorVPRReflow)
tp
CriticalZone
Ramp-up
TLtoTP
tL
ts
Preheat
t25CtoPeak
Ramp-down
Tsmin
Tsmax
TP
Temperature
TL
25
ClassificatinReflowProfiles
Time
ProfileFeature
Sn-PbEutectic
溫馨提示
- 1. 本站所有資源如無(wú)特殊說(shuō)明,都需要本地電腦安裝OFFICE2007和PDF閱讀器。圖紙軟件為CAD,CAXA,PROE,UG,SolidWorks等.壓縮文件請(qǐng)下載最新的WinRAR軟件解壓。
- 2. 本站的文檔不包含任何第三方提供的附件圖紙等,如果需要附件,請(qǐng)聯(lián)系上傳者。文件的所有權(quán)益歸上傳用戶所有。
- 3. 本站RAR壓縮包中若帶圖紙,網(wǎng)頁(yè)內(nèi)容里面會(huì)有圖紙預(yù)覽,若沒(méi)有圖紙預(yù)覽就沒(méi)有圖紙。
- 4. 未經(jīng)權(quán)益所有人同意不得將文件中的內(nèi)容挪作商業(yè)或盈利用途。
- 5. 人人文庫(kù)網(wǎng)僅提供信息存儲(chǔ)空間,僅對(duì)用戶上傳內(nèi)容的表現(xiàn)方式做保護(hù)處理,對(duì)用戶上傳分享的文檔內(nèi)容本身不做任何修改或編輯,并不能對(duì)任何下載內(nèi)容負(fù)責(zé)。
- 6. 下載文件中如有侵權(quán)或不適當(dāng)內(nèi)容,請(qǐng)與我們聯(lián)系,我們立即糾正。
- 7. 本站不保證下載資源的準(zhǔn)確性、安全性和完整性, 同時(shí)也不承擔(dān)用戶因使用這些下載資源對(duì)自己和他人造成任何形式的傷害或損失。
最新文檔
- 2025至2030新零售模式下消費(fèi)者行為變遷與商業(yè)價(jià)值評(píng)估研究報(bào)告
- 熊貓汽車活動(dòng)策劃方案(3篇)
- 鋪軌基礎(chǔ)施工方案(3篇)
- 會(huì)議活動(dòng)策劃方案封面(3篇)
- 餐飲活動(dòng)策劃方案流程(3篇)
- 醫(yī)院營(yíng)銷活動(dòng)方案策劃(3篇)
- 時(shí)尚活動(dòng)策劃方案大全(3篇)
- 冷暖管道施工方案(3篇)
- 中國(guó)施工方案分享(3篇)
- 擺攤早餐活動(dòng)方案策劃(3篇)
- AI技術(shù)在人力資源管理中的實(shí)際應(yīng)用案例分享
- 急診預(yù)檢分診課件教學(xué)
- (完整版)小學(xué)一年級(jí)20以內(nèi)加減法混合運(yùn)算3000題(每頁(yè)100題-已排版)
- GB/T 46509-2025玩具中揮發(fā)性有機(jī)化合物釋放量的測(cè)定
- 2026屆浙江省杭州城區(qū)6學(xué)校數(shù)學(xué)七年級(jí)第一學(xué)期期末教學(xué)質(zhì)量檢測(cè)試題含解析
- 2025年中國(guó)菜板市場(chǎng)調(diào)查研究報(bào)告
- 《杭州市建設(shè)工程消防驗(yàn)收技術(shù)導(dǎo)則》
- 總公司與分公司承包協(xié)議6篇
- 塔吊安裝安全培訓(xùn)教育課件
- 民事答辯狀(信用卡糾紛)樣式
- 設(shè)備安裝施工應(yīng)急預(yù)案
評(píng)論
0/150
提交評(píng)論