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系统在某一过程中，温度升高（或降低）1℃所吸收（或放出）的热量叫做这个系统在该过程中的“热容量”。如果在的过程中，当温度升高ΔT时，系统从外界吸收的热量为ΔQ，那么在该过程中该系统的热容量为(见图)
热容量的单位是焦耳/开。系统的热容量与状态的转变过程有关。在提到系统或物质的热容量时，指明状态的转变过程。系统的热容量还与它所包含的物质的质量成正比，不同过程的热容量不同。
为计算简便，常用水当量的概念，如某系统的热容量与多少克水的热容量相等，即称该系统的水当量为多少克。所以任何系统的热容量在数值上就等于它的水当量。
通常规定，系统吸收的热量为正值，而释放的热量为负值，故在系统吸收热量引起温度升高时，热容量为正值。也有的系统，如饱和水蒸汽，在温度升高时，释放热量，故其热容量为负值。
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【美国，英维思 Invensys FOXBORO I\A系统, Triconex ESD系统】
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【美国Motorola（摩托罗拉）：MVME 162、MVME 167、MVME1772、MVME177等系列】 Leica 31-35-28 120V 50/60Hz 25 WATT Illuminator Transformer
Skystream Networks 4-Channel ASI IN Interface Module 031-0040-04
Oriental Motor 2TK3GN-A 3W 50/60Hz 100V Toque Motor
Skystream Networks DVB-ASI TX PMC 031-0041-04 Asynchronous Serial Interface Out
Raz Bar Code Reader Wand MSH119/R02DR - AC-006-02409
RocketRAID 133 V2.35 2CH ATA133 RAID Host Controller
SOYO SB-P4SX 4-Port USB Hub Internal Adapter -
Adams Electronics AMD 500 Portable
Advansys AdvanSCSI PCI Ultra SCSI
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Altera Plad5032 Adapter
APTech Diaphragm Regulator AP1510S w/ Millipore 0-100PSI Gauge 01-0140-E
Cypress QuickPro II Adapter CY3316
Cypress QuickPro II Adapter CY3320
Cypress QuickPro II Adapter CY3342
Cypress QuickPro II Adapter CY3342F
Cypress QuickPro II CY33435 Adapter
Cypress Universal Programmer CY3501A - Model CYpASIC
GRC LZ104 Laser Toner Cartridge
IBM 7524/Norand-Intermec TM1700 Handheld Barcode Scanner - Parts/For Repair
Brother TN-5000PF Toner Cartridge
Matheson 1PA 510 Regulator
Matheson Air Pressure Regulator 3000 PSI - Dual Gauge
Matheson Air Pressure Regulator Dual Gauge - 3000 PSI
Mitsubishi TL3-11C4 Ink Sheet Roll for Thermal Color Printer - 2 Rolls, 4 Colors
Radio Frequency Systems 20011127 Tower Antenna Mounting Kit
IBX Async Data Interface Modular Unit P/N 5200010001
ICE Communications Inc. UF-1000-A P/N 6300-01
Louroe Electronics AP-1TB Single Zone Audio Base Station W/Talkback - FOR PARTS
Norand RB4000 Intermec RC4030 Controller
Paradyne 3160-A3-210 2-Port DSU/CSU Modem
Thoratec Heartmate II System Controller 105472
DIGI Matex DC-130 Digital Counting Scale - FOR PARTS OR REPAIR
Magnum TV Tuner Card FQ1216ME/I H-5
Magnum TV Tuner Card FQ1216ME/I H-5
Magnum TV Tuner Card Rev.A With NXP FQ1216ME/I H-5
Acsys TRAC 8 Token Ring 8-Port Concentrator P/N 98000-3
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QualysGuard Scanner Appliance II QGSA-2100-B1
Cabletron Systems SEH-34 10Base-T Hub w/ Lanview
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GE Motors 5KH32GN68HX 1/4HP 60Hz 230V 1725 RPM 1 Phase Motor
Loctite Corporation Zeta 7000 Model 981000 P/N 3142 120V 60Hz 420W Illuminator
NEC Corporation TI-26A S CCD Camera Control Unit
Puregas 550 Air Dryer W/Heatless Dryer PHF2C106126 & GE M100BX AC Motor
Allen-Bradley 513-BDB-6-41 Combination Motor Starter Enclosure - Empty Inside
Anritsu MN9320A Tunable Optical Channel Drop Unit DWDM - Damaged
Anritsu MN9320A Tunable Optical Channel Drop Unit, DWDM
Comdial G1632 Phone Station System
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Saftronics GP10 3PH General Purpose Open Loop Vector AC Drive GP10E9ST34050B1
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Feinfocus FVX 400.23 Block Type MSU 2420/05 5000 VA X-Ray Power Supply
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EBM-PAPST 27W 24VDC Dual Fan Assembly 045-000-055 FA-225-600-002
ISCO B-Band 07400-450 RF2. B RX/DX Enhanced Tray Filter 835-849 MHz/880-894 MHz
Cooler Master DCC-00101 Nvidia 367-0147-001 Fansink -
Nuko VF-1000D MPEG-2 Decoder
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TerraCom RF Tray Prot Chassis LMC-411D2 Power Amplifier Assembly 10700-11700 MHz
Perkin Elmer GeneAmp PCR System 9600 P/N N801-0001 - Parts
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Novelleus 02-165991-00 RF Match Matching Network Fan
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Precision Plate Tooling Kit Baffle Alignment 1099-0214-000 - Incomplete
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ADC Kentrox T-SERV II CSU Module
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Packeteer PacketShaper 4000 Version 3.00-g30 - FOR PARTS OR REPAIR
Louroe AP-1TB Single Zone Audio Surveillance W/ Talkback - No Power Adpater
Paradyne 3164-A2-218-0GB Spinn 4-Port DSU/CSU Without Power Adapter
Riverbed LBL-00083-100 Steelhead 100/200 Application Accelerator
Riverbed Steelhead 100/200 Application Accelerator LBL-00068-100
Riverbed Steelhead 100/200 Application Accelerator LBL-00083-100
Boca 10Base-T Concentrator BEN210
ADC 1307777 FMT Rackmount Patch Panel
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