在程序設(shè)計(jì)中，為完成某一功能所需的一段程序或子程序；或指能由編譯程序、裝配程序等處理的獨(dú)立程序單位；或指大型軟件系統(tǒng)的一部分。
模塊,又稱構(gòu)件,是能夠單獨(dú)命名并獨(dú)立地完成一定功能的程序語句的集合（即程序代碼和數(shù)據(jù)結(jié)構(gòu)的集合體）。它具有兩個(gè)基本的特征：外部特征和內(nèi)部特征。外部特征是指模塊跟外部環(huán)境的接口（即其他模塊或程序調(diào)用該模塊的方式，包括有輸入輸出參數(shù)、引用的全局變量）和模塊的功能；內(nèi)部特征是指模塊的內(nèi)部環(huán)境具有的特點(diǎn)（即該模塊的局部數(shù)據(jù)和程序代碼）。
模塊有各種類型，如單元操作模塊（換熱器、精餾塔、壓縮機(jī)等）、計(jì)算方法模塊（加速收斂算法、*化算法等）、物理化學(xué)性質(zhì)模塊（汽液相平衡計(jì)算、熱焓計(jì)算等）等。

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NEW GOODYEAR 5VX1180 HY-T WEDGE COGGED 118 IN 5/8 IN V-BELT BELT D449360

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REXNORD LF821-K10 CONVEYOR TABLETOP 92X10 IN CHAIN BELT D227945

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GATES 2/5V1500 SUPER HC POWERBAND 2-BANDED 150 IN 1-3/8 IN V-BELT BELT B430401

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REXNORD REX820 TABLETOP CONVEYOR 420X7-1/2 IN BELT B339269

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REX SSC881 8477 STAINLESS TABLE FLAT TOP CONVEYOR 146INX7-1/2IN IN BELT B298435

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GATES B65 HI-POWER II O&HR V80 TRANSMISSION 68 IN 21/32 IN V-BELT BELT B430292

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AMMERAAL BELTECH EC4/1 00+0 BEIGE 11-1/2FT 40 IN CONVEYOR BELT B398004

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REXNORD LF882 TABLETOP K 750 10FT 7-1/2 IN CONVEYOR BELT B435529

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NEW 14-1/2 IN 3-3/4 IN BELT D450353

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 DYNA-VEYOR DV-450-820 TABLE TOP CONVEYOR 260X4-1/2 IN BELT B337708

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NEW B78 INDUSTRIAL POWER BANDED V-BELT 81X5/8 IN BELT B317800

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NEW GOODYEAR 1125-5M-25 HI-PERFORMANCE PD 1125X25MM 5MM TIMING BELT D405919

NEW GATES B73 HI-POWER II 76 IN 21/32 IN V-BELT D479028

NEW GATES 3VX850 SUPER HC POWERBAND NOTCH V-BELT 85 X1-1/2 IN  D385918

NEW GOODYEAR 322L075 PD 32-1/4 IN 3/4 IN 3/8 IN TIMING BELT B478139

NEW GATES BX62 TRI POWER VEXTRA V80 65 IN 21/32 IN V-BELT D416261

NEW POLYTECH DESIGN HTD459-3M TIMING BELT D360903

NEW AMMERAAL-BELTECH 43449-40X12 COGGED VGDE CONVEYOR 480X12 IN BELT D223814

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HABASIT FNB5E+H15 ENDLESS FLEXPROOF 3450MM 700MM CONVEYOR BELT B379844

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NEW GATES 5VX1500 SUPER HC V-BELT 150X5/8 IN BELT D253518

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NEW REXNORD 882TAB FLAT TABLE TOP 40 IN 10 IN CONVEYOR BELT B440699

NEW JASON T5 500 T5-500-15 500MM 15MM 5MM TIMING BELT D426267

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NEW MITSUBOSHI 100XL025 TIMING 10X1/4IN BELT D361506

MIR PU-2 FOOD GRADE FLAT SS CLIPPER LACED CONVEYOR 23FT X 6-1/2IN BELT B201949

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NEW FLEXLINK XLTP5 ROLLER WHITE PLAIN 140 IN 2-1/2 IN 1 IN CONVEYOR BELT B436056

NEW JASON 3L-440 V-BELT 44X1/4 IN BELT B212222

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NEW NA WHITE SMOOTH OPEN-ENDED CONVEYOR 120X4IN BELT 10FT D238393

NEW GOODYEAR 4L570 A55 HY-T PLUS MATCHMAKER 57 IN 1/2 IN V-BELT BELT D425512

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NEW AMMERAAL BELTECH ES6/2 00+0 FIRST INCLINE CONVEYOR 468X42 IN BELT B361884

NEW FR DRAKE 00-426 OPEN MESH CONVEYOR 76X32 IN BELT D219611

NEW GATES 225L100 POWERGRIP 22-1/2 IN 1 IN 3/8 IN TIMING BELT D462745

NEW AMETRIC AT10-1320 1320MM 50MM 10MM TIMING BELT D429391

NEW MEGADYNE 235 RPP5 ISORAN 235MM 9MM 5MM TIMING BELT D443452

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NEW SYNCHROFLEX 20 AT5/1750 1750X20MM 5MM TIMING BELT D382190

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NEW GATES 3VX850 SUPER HC VEXTRA V80 85 IN 3/8 IN V-BELT BELT B455403

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NEW GATES 5VX530 SUPER HC VEXTRA 53 IN 5/8 IN V-BELT D477488

NEW GOODYEAR 5VX730 HY-T WEDGE 73 IN 5/8 IN V-BELT BELT B478063

NEW FORMAX 047760-B 3/8IN PITCH TIMING 8 FT-6 IN X 1 IN BELT D260342

NEW MEGADYNE AT10-610-32 610MM LONG 32MM WIDE 10MM PITCH TIMING BELT D395967

NEW HABASIT 426-1295 ENDLESS CONVEYOR 23X3/4 IN BELT D246124

NEW GATES 5V1800 SUPER HC 180 IN 5/8 IN V-BELT BELT B412969

NEW UNI-CHAINS 30LF820K400 LF 820-K400 ACETAL CONVEYOR 120X4IN 10FT BELT D282651

NEW REXNORD HT4705 TABLETOP CHAIN 10FT CONVEYOR 120X14 IN BELT D320186

NEW MIDWEST INDUSTRIAL RUBBER 11829 CONVEYOR BELT 153-1/4 IN 12-1/2 IN D446148

NEW AMMERAAL BELTECH 400491 ALLIGATOR LACE CONVEYOR 50-1/4X3/4 IN BELT D280916

NEW FN SHEPPARD F3T7-4C-10AS V-GUIDE 259X10IN CONVEYOR BELT D419665

NEW SPARKS GRIP-TEX 25FT RUFF RIDGE RED CONVEYOR 300X4 IN BELT D331004

NEW SIEGLING TYPE E8/2 UO/U2 GREEN CONVEYOR 2299X216MM BELT B296498

NEW GOODMAN PACKAGING EQUIPMENT AT10-50 02.60 208-1/2X2IN CONVEYOR BELT D394079