Dvoruba [#7780433924810]

Rennie Holdings [#3791814912]
类型:
行星哨站
天体:
Dvoruba 1 (77 光秒)
坐标: 58.9159 / -168.585

拥护:
联邦
政府:
企业
经济:
精炼

设施:
商品
船厂
配装
Apex Interstellar Transport, Contacts, Crew Lounge, Frontline Solutions, Missions, Pioneer Supplies, Refuel, Repair, Restock, Search and Rescue, Tuning, Universal Cartographics, Vista Genomics

派系状态:
None

禁止:
Narcotics, Battle Weapons, Bootleg Liquor, Combat Stabilisers, Imperial Slaves, Landmines, Onionhead Gamma Strain, Personal Weapons, Slaves, Tobacco
最后更新: 24/4/5 下午1:28

Chemicals

Buy price Stock Sell price Demand
Agronomic Treatment -- -- 3,619 cr 5 吨
Anduliga Fire Works* 707 cr -- 706 cr 0 吨
Delta Phoenicis Palms* 331 cr -- 330 cr 0 吨
Explosives 197 cr 7,961 吨 179 cr 1 吨
HIP Organophosphates* 310 cr -- 309 cr 0 吨
Hydrogen Fuel 84 cr 4,597 吨 80 cr 1 吨
Hydrogen Peroxide -- -- 3,161 cr 15,332 吨
Koro Kung Pellets* 194 cr -- 193 cr 0 吨
Liquid Oxygen 741 cr 2,794 吨 659 cr 1 吨
Mineral Oil 84 cr -- 83 cr 0 吨
Nerve Agents 12,102 cr 85 吨 11,958 cr 1 吨
Pesticides 106 cr -- 105 cr 0 吨
Rockforth Fertiliser 3 cr -- 2 cr 0 吨
Surface Stabilisers 486 cr 2,211 吨 455 cr 1 吨
Synthetic Reagents 6,086 cr 287 吨 6,014 cr 1 吨
Toxandji Virocide* 430 cr -- 429 cr 0 吨
Tritium 39,604 cr -- 39,602 cr 0 吨
Water -- -- 234 cr 2,156 吨

Consumer Items

Buy price Stock Sell price Demand
Alacarakmo Skin Art 1,138 cr -- 1,137 cr 0 吨
Altairian Skin* 608 cr -- 607 cr 0 吨
Buckyball Beer Mats 70 cr -- 69 cr 0 吨
Clothing -- -- 426 cr 579 吨
Consumer Technology -- -- 7,402 cr 198 吨
Crystalline Spheres* 4,902 cr -- 4,901 cr 0 吨
Domestic Appliances -- -- 647 cr 174 吨
Duradrives 13,002 cr -- 13,001 cr 0 吨
Eleu Thermals 693 cr -- 692 cr 0 吨
Eshu Umbrellas 1,642 cr -- 1,641 cr 0 吨
Evacuation Shelter -- -- 748 cr 28 吨
Havasupai Dream Catcher* 7,650 cr -- 7,649 cr 0 吨
Jaques Quinentian Still* 6,750 cr -- 6,749 cr 0 吨
Jaradharre Puzzle Box* 10,120 cr -- 10,119 cr 0 吨
Jotun Mookah* 1,003 cr -- 1,002 cr 0 吨
Karetii Couture 4,182 cr -- 4,181 cr 0 吨
Kinago Violins 5,825 cr -- 5,824 cr 0 吨
Leathery Eggs* 19,482 cr -- 19,481 cr 0 吨
Momus Bog Spaniel* 1,462 cr -- 1,461 cr 0 吨
Nguna Modern Antiques 737 cr -- 736 cr 0 吨
Njangari Saddles 522 cr -- 521 cr 0 吨
Ophiuch Exino Artefacts 3,486 cr -- 3,485 cr 0 吨
Personal Gifts 9,802 cr -- 9,801 cr 0 吨
Rajukru Multi-Stoves 547 cr -- 546 cr 0 吨
Shan's Charis Orchid 1,302 cr -- 1,301 cr 0 吨
Soontill Relics* 13,602 cr -- 13,601 cr 0 吨
Survival Equipment -- -- 754 cr 3 吨
The Hutton Mug* 102 cr -- 101 cr 0 吨
Tiolce Waste2Paste Units 924 cr -- 923 cr 0 吨
Ultra-Compact Processor Prototypes 15,482 cr -- 15,481 cr 0 吨
Uzumoku Low-G Wings* 6,750 cr -- 6,749 cr 0 吨
Vidavantian Lace* 5,354 cr -- 5,353 cr 0 吨
Zeessze Ant Grub Glue* 301 cr -- 300 cr 0 吨

Foods

Buy price Stock Sell price Demand
Aepyornis Egg* 2,125 cr -- 2,124 cr 0 吨
Albino Quechua Mammoth Meat 2,032 cr -- 2,031 cr 0 吨
Algae 33 cr -- 32 cr 0 吨
Animal Meat -- -- 1,424 cr 161 吨
Any Na Coffee 1,434 cr -- 1,433 cr 0 吨
Arouca Conventual Sweets* 954 cr -- 953 cr 0 吨
Baked Greebles 358 cr -- 357 cr 0 吨
Baltah'sine Vacuum Krill 662 cr -- 661 cr 0 吨
CD-75 Kitten Brand Coffee 1,900 cr -- 1,899 cr 0 吨
Ceremonial Heike Tea* 1,538 cr -- 1,537 cr 0 吨
Ceti Rabbits 1,342 cr -- 1,341 cr 0 吨
Chi Eridani Marine Paste 629 cr -- 628 cr 0 吨
Coffee -- -- 1,535 cr 41 吨
Coquim Spongiform Victuals 206 cr -- 205 cr 0 吨
Deuringas Truffles 1,515 cr -- 1,514 cr 0 吨
Diso Ma Corn* 270 cr -- 269 cr 0 吨
Eden Apples Of Aerial 494 cr -- 493 cr 0 吨
Esuseku Caviar 1,962 cr -- 1,961 cr 0 吨
Ethgreze Tea Buds* 2,610 cr -- 2,609 cr 0 吨
Fish -- -- 518 cr 449 吨
Food Cartridges -- -- 341 cr 31 吨
Fruit and Vegetables -- -- 516 cr 146 吨
Giant Irukama Snails 1,450 cr -- 1,449 cr 0 吨
Goman Yaupon Coffee 1,162 cr -- 1,161 cr 0 吨
Grain -- -- 315 cr 966 吨
HIP 10175 Bush Meat 1,686 cr -- 1,685 cr 0 吨
HIP Proto-Squid 1,192 cr -- 1,191 cr 0 吨
HR 7221 Wheat 334 cr -- 333 cr 0 吨
Haiden Black Brew* 1,067 cr -- 1,066 cr 0 吨
Helvetitj Pearls 2,898 cr -- 2,897 cr 0 吨
Jaroua Rice 310 cr -- 309 cr 0 吨
Karsuki Locusts 734 cr -- 733 cr 0 吨
LTT Hyper Sweet* 179 cr -- 178 cr 0 吨
Live Hecate Sea Worms 954 cr -- 953 cr 0 吨
Mechucos High Tea* 1,078 cr -- 1,077 cr 0 吨
Mokojing Beast Feast* 2,146 cr -- 2,145 cr 0 吨
Mukusubii Chitin-os* 525 cr -- 524 cr 0 吨
Mulachi Giant Fungus* 70 cr -- 69 cr 0 吨
Neritus Berries 682 cr -- 681 cr 0 吨
Ochoeng Chillies 800 cr -- 799 cr 0 吨
Orrerian Vicious Brew* 506 cr -- 505 cr 0 吨
Sanuma Decorative Meat* 690 cr -- 689 cr 0 吨
Synthetic Meat -- -- 679 cr 230 吨
Tanmark Tranquil Tea* 1,453 cr -- 1,452 cr 0 吨
Tea -- -- 1,712 cr 146 吨
Uszaian Tree Grub* 774 cr -- 773 cr 0 吨
Utgaroar Millennial Eggs 1,438 cr -- 1,437 cr 0 吨
Void Extract Coffee* 1,881 cr -- 1,880 cr 0 吨
Wheemete Wheat Cakes* 210 cr -- 209 cr 0 吨
Witchhaul Kobe Beef 3,618 cr -- 3,617 cr 0 吨

Industrial Materials

Buy price Stock Sell price Demand
CMM Composite 5,401 cr 30 吨 5,338 cr 1 吨
Ceramic Composites 164 cr 2,740 吨 140 cr 1 吨
Insulating Membrane 7,525 cr -- 7,524 cr 0 吨
Medb Starlube* 334 cr -- 333 cr 0 吨
Meta-Alloys 148,648 cr -- 148,640 cr 0 吨
Micro-weave Cooling Hoses 763 cr -- 762 cr 0 吨
Neofabric Insulation 3,483 cr -- 3,482 cr 0 吨
Polymers 103 cr 10,316 吨 77 cr 1 吨
Semiconductors 809 cr 1,397 吨 775 cr 1 吨
Superconductors 5,978 cr 2,846 吨 5,908 cr 1 吨

Legal Drugs

Buy price Stock Sell price Demand
Apa Vietii 2,798 cr -- 2,797 cr 0 吨
Azure Milk* 3,300 cr -- 3,299 cr 0 吨
Bast Snake Gin* 866 cr -- 865 cr 0 吨
Beer -- -- 283 cr 1,010 吨
Centauri Mega Gin* 2,633 cr -- 2,632 cr 0 吨
Chateau De Aegaeon* 1,015 cr -- 1,014 cr 0 吨
Gerasian Gueuze Beer* 362 cr -- 361 cr 0 吨
Harma Silver Sea Rum 2,118 cr -- 2,117 cr 0 吨
Indi Bourbon* 1,032 cr -- 1,031 cr 0 吨
Kongga Ale 470 cr -- 469 cr 0 吨
Lavian Brandy 2,802 cr -- 2,801 cr 0 吨
Liquor -- -- 841 cr 60 吨
Saxon Wine* 1,234 cr -- 1,233 cr 0 吨
Thrutis Cream* 742 cr -- 741 cr 0 吨
Wine -- -- 362 cr 517 吨

Machinery

Buy price Stock Sell price Demand
Articulation Motors 4,579 cr -- 4,578 cr 0 吨
Atmospheric Processors 227 cr -- 226 cr 0 吨
Building Fabricators -- -- 2,296 cr 424 吨
Crop Harvesters 1,409 cr -- 1,408 cr 0 吨
Emergency Power Cells 1,409 cr -- 1,408 cr 0 吨
Energy Grid Assembly 1,618 cr -- 1,617 cr 0 吨
Exhaust Manifold 1,073 cr -- 1,072 cr 0 吨
Geological Equipment -- -- 2,033 cr 54 吨
Giant Verrix* 5,219 cr -- 5,218 cr 0 吨
HN Shock Mount 1,140 cr -- 1,139 cr 0 吨
Heatsink Interlink 1,229 cr -- 1,228 cr 0 吨
Magnetic Emitter Coil 710 cr -- 709 cr 0 吨
Marine Equipment 2,833 cr -- 2,832 cr 0 吨
Microbial Furnaces -- -- 761 cr 14,958 吨
Mineral Extractors 350 cr -- 349 cr 0 吨
Modular Terminals 1,140 cr -- 1,139 cr 0 吨
Non Euclidian Exotanks* 715 cr -- 714 cr 0 吨
Power Converter 763 cr -- 762 cr 0 吨
Power Generators -- -- 2,442 cr 404 吨
Power Transfer Bus 1,324 cr -- 1,323 cr 0 吨
Radiation Baffle 996 cr -- 995 cr 0 吨
Reinforced Mounting Plate 1,519 cr -- 1,518 cr 0 吨
Skimmer Components -- -- 1,193 cr 12 吨
Thermal Cooling Units -- -- 3,792 cr 173 吨
Volkhab Bee Drones 2,611 cr -- 2,610 cr 0 吨
Water Purifiers -- -- 411 cr 245 吨
Wulpa Hyperbore Systems* 942 cr -- 941 cr 0 吨

Medicines

Buy price Stock Sell price Demand
Advanced Medicines -- -- 1,828 cr 435 吨
Agri-Medicines 624 cr -- 623 cr 0 吨
Alya Body Soap* 365 cr -- 364 cr 0 吨
Basic Medicines -- -- 518 cr 48 吨
Fujin Tea* 795 cr -- 794 cr 0 吨
Honesty Pills* 1,094 cr -- 1,093 cr 0 吨
Kachirigin Filter Leeches 375 cr -- 374 cr 0 吨
Nanomedicines 2,227 cr -- 2,226 cr 0 吨
Pantaa Prayer Sticks* 1,454 cr -- 1,453 cr 0 吨
Performance Enhancers -- -- 7,402 cr 90 吨
Progenitor Cells -- -- 7,402 cr 111 吨
Tauri Chimes* 741 cr -- 740 cr 0 吨
The Waters Of Shintara* 6,598 cr -- 6,597 cr 0 吨
V Herculis Body Rub* 130 cr -- 129 cr 0 吨
Vega Slimweed* 1,920 cr -- 1,919 cr 0 吨

Metals

Buy price Stock Sell price Demand
Aluminium 307 cr 10,549 吨 285 cr 1 吨
Beryllium 7,421 cr 1,214 吨 7,335 cr 1 吨
Bismuth 1,897 cr 9,913 吨 1,849 cr 1 吨
Cobalt 2,876 cr 1,712 吨 2,747 cr 1 吨
Copper 435 cr 6,136 吨 406 cr 1 吨
Gallium 4,584 cr 3,490 吨 4,475 cr 1 吨
Gold 44,481 cr 141 吨 43,973 cr 1 吨
Indium 5,263 cr 3,154 吨 5,201 cr 1 吨
Lanthanum 7,891 cr 357 吨 7,800 cr 1 吨
Lithium 1,395 cr 875 吨 1,358 cr 1 吨
Osmium 14,931 cr -- 14,930 cr 0 吨
Palladium 37,736 cr -- 37,734 cr 0 吨
Platinum 32,400 cr -- 32,398 cr 0 吨
Platinum Alloy 11,842 cr -- 11,841 cr 0 吨
Praseodymium 5,284 cr -- 5,283 cr 0 吨
Samarium 17,134 cr -- 17,133 cr 0 吨
Silver 33,802 cr 372 吨 32,995 cr 1 吨
Sothis Crystalline Gold* 12,726 cr -- 12,725 cr 0 吨
Tantalum 3,486 cr 434 吨 3,401 cr 1 吨
Thallium 3,073 cr 6,928 吨 2,998 cr 1 吨
Thorium 10,510 cr 192 吨 10,390 cr 1 吨
Titanium 908 cr 6,293 吨 869 cr 1 吨
Uranium 2,360 cr 5,839 吨 2,301 cr 1 吨

Minerals

Buy price Stock Sell price Demand
Alexandrite -- -- 208,299 cr 63 吨
Bauxite -- -- 1,613 cr 20,328 吨
Benitoite -- -- 141,884 cr 63 吨
Bertrandite -- -- 21,498 cr 9,426 吨
Bromellite 19,252 cr -- 19,251 cr 0 吨
Cherbones Blood Crystals* 10,005 cr -- 10,004 cr 0 吨
Coltan -- -- 7,670 cr 14,943 吨
Cryolite -- -- 14,618 cr 5,225 吨
Gallite -- -- 13,675 cr 6,717 吨
Goslarite -- -- 7,766 cr 11,260 吨
Grandidierite -- -- 187,903 cr 63 吨
Indite -- -- 13,305 cr 5,225 吨
Jadeite 28,569 cr -- 28,567 cr 0 吨
Lepidolite -- -- 1,210 cr 15,332 吨
Lithium Hydroxide -- -- 5,706 cr 2,823 吨
Low Temperature Diamonds -- -- 96,879 cr 42 吨
Methane Clathrate -- -- 1,643 cr 24,320 吨
Methanol Monohydrate Crystals 1,140 cr -- 1,139 cr 0 吨
Moissanite 15,427 cr -- 15,426 cr 0 吨
Monazite -- -- 196,375 cr 25 吨
Musgravite -- -- 189,447 cr 63 吨
Ngadandari Fire Opals* 12,726 cr -- 12,725 cr 0 吨
Painite -- -- 48,689 cr 51 吨
Pyrophyllite -- -- 14,172 cr 9,654 吨
Rhodplumsite -- -- 171,842 cr 51 吨
Rutile -- -- 2,655 cr 8,680 吨
Serendibite -- -- 164,487 cr 63 吨
Taaffeite 36,264 cr -- 36,262 cr 0 吨
Uraninite -- -- 4,047 cr 21,399 吨
Void Opals -- -- 129,560 cr 25 吨

Salvage

Buy price Stock Sell price Demand
Ancient Casket 6,547 cr -- 6,546 cr 0 吨
Ancient Key 11,757 cr -- 11,756 cr 0 吨
Ancient Orb 7,002 cr -- 7,001 cr 0 吨
Ancient Relic 10,615 cr -- 10,614 cr 0 吨
Ancient Tablet 7,002 cr -- 7,001 cr 0 吨
Ancient Totem 8,571 cr -- 8,570 cr 0 吨
Ancient Urn 4,929 cr -- 4,928 cr 0 吨
Antique Jewellery 138,947 cr -- 138,940 cr 0 吨
Assault Plans 13,552 cr -- 13,551 cr 0 吨
Caustic Tissue Sample 51,149 cr -- 51,146 cr 0 吨
Commercial Samples 710 cr -- 709 cr 0 吨
Coral Sap 97,557 cr -- 97,552 cr 0 吨
Data Core 4,016 cr -- 4,015 cr 0 吨
Diplomatic Bag 17,387 cr -- 17,386 cr 0 吨
Earth Relics 9,927 cr -- 9,926 cr 0 吨
Encrypted Correspondence 4,077 cr -- 4,076 cr 0 吨
Encrypted Data Storage 4,193 cr -- 4,192 cr 0 吨
Fossil Remnants 7,525 cr -- 7,524 cr 0 吨
Galactic Travel Guide 359 cr -- 358 cr 0 吨
Gene Bank 39,430 cr -- 39,428 cr 0 吨
Geological Samples 4,193 cr -- 4,192 cr 0 吨
Large Survey Data Cache 196,727 cr -- 196,717 cr 0 吨
Mollusc Brain Tissue 22,891 cr -- 22,889 cr 0 吨
Mollusc Fluid 3,483 cr -- 3,482 cr 0 吨
Mollusc Membrane 12,261 cr -- 12,260 cr 0 吨
Mollusc Mycelium 22,891 cr -- 22,889 cr 0 吨
Mollusc Soft Tissue 11,470 cr -- 11,469 cr 0 吨
Mollusc Spores 3,483 cr -- 3,482 cr 0 吨
Mysterious Idol 14,013 cr -- 14,012 cr 0 吨
Pod Core Tissue 2,623 cr -- 2,622 cr 0 吨
Pod Dead Tissue 8,593 cr -- 8,592 cr 0 吨
Pod Mesoglea 18,720 cr -- 18,719 cr 0 吨
Pod Outer Tissue 4,288 cr -- 4,287 cr 0 吨
Pod Shell Tissue 37,429 cr -- 37,427 cr 0 吨
Pod Surface Tissue 20,019 cr -- 20,017 cr 0 吨
Pod Tissue 8,041 cr -- 8,040 cr 0 吨
Precious Gems 121,408 cr -- 121,401 cr 0 吨
Protective Membrane Scrap 22,891 cr -- 22,889 cr 0 吨
Rare Artwork 10,321 cr -- 10,320 cr 0 吨
SAP 8 Core Container 49,509 cr -- 49,506 cr 0 吨
Scientific Research 9,254 cr -- 9,253 cr 0 吨
Scientific Samples 3,770 cr -- 3,769 cr 0 吨
Small Survey Data Cache 16,497 cr -- 16,496 cr 0 吨
Space Pioneer Relics 6,099 cr -- 6,098 cr 0 吨
Tactical Data 8,890 cr -- 8,889 cr 0 吨
Thargoid Basilisk Tissue Sample 52,957 cr -- 52,954 cr 0 吨
Thargoid Biological Matter 37,429 cr -- 37,427 cr 0 吨
Thargoid Cyclops Tissue Sample 45,799 cr -- 45,796 cr 0 吨
Thargoid Glaive Tissue Sample -- -- 71,499 cr 5 吨
Thargoid Heart 104,992 cr -- 104,986 cr 0 吨
Thargoid Hydra Tissue Sample 80,173 cr -- 80,168 cr 0 吨
Thargoid Link 37,429 cr -- 37,427 cr 0 吨
Thargoid Medusa Tissue Sample 60,593 cr -- 60,589 cr 0 吨
Thargoid Orthrus Tissue Sample 74,400 cr -- 74,396 cr 0 吨
Thargoid Probe 345,854 cr -- 345,836 cr 0 吨
Thargoid Resin 22,891 cr -- 22,889 cr 0 吨
Thargoid Scout Tissue Sample 16,197 cr -- 16,196 cr 0 吨
Thargoid Scythe Tissue Sample 52,957 cr -- 52,954 cr 0 吨
Thargoid Sensor 235,660 cr -- 235,648 cr 0 吨
Thargoid Technology Samples 28,302 cr -- 28,300 cr 0 吨
Time Capsule 3,022 cr -- 3,021 cr 0 吨
Titan Deep Tissue Sample -- -- 498,040 cr 5 吨
Titan Maw Deep Tissue Sample 476,638 cr -- 476,614 cr 0 吨
Titan Maw Partial Tissue Sample 209,538 cr -- 209,527 cr 0 吨
Titan Maw Tissue Sample 317,630 cr -- 317,614 cr 0 吨
Titan Partial Tissue Sample -- -- 139,264 cr 5 吨
Titan Tissue Sample -- -- 272,096 cr 5 吨
Titan drive component* 276,927 cr -- 276,913 cr 0 吨
Unclassified Relic 4,580 cr -- 4,579 cr 0 吨
Unoccupied Escape Pod -- -- 4,061 cr 5 吨
Unstable Data Core 2,460 cr -- 2,459 cr 0 吨

Technology

Buy price Stock Sell price Demand
AZ Cancri Formula 42* 5,155 cr -- 5,154 cr 0 吨
Advanced Catalysers -- -- 3,633 cr 8,502 吨
Animal Monitors 159 cr -- 158 cr 0 吨
Aquaponic Systems 142 cr -- 141 cr 0 吨
Auto-Fabricators 2,460 cr -- 2,459 cr 0 吨
Bioreducing Lichen 581 cr -- 580 cr 0 吨
Classified Experimental Equipment 4,002 cr -- 4,001 cr 0 吨
Computer Components 307 cr -- 306 cr 0 吨
H.E. Suits -- -- 845 cr 6,620 吨
Hardware Diagnostic Sensor 4,579 cr -- 4,578 cr 0 吨
Ion Distributor 1,409 cr -- 1,408 cr 0 吨
Land Enrichment Systems 3,263 cr -- 3,262 cr 0 吨
Medical Diagnostic Equipment 1,858 cr -- 1,857 cr 0 吨
Micro Controllers 3,718 cr -- 3,717 cr 0 吨
Muon Imager 4,288 cr -- 4,287 cr 0 吨
Nanobreakers 1,073 cr -- 1,072 cr 0 吨
Resonating Separators -- -- 6,813 cr 4,836 吨
Robotics 1,140 cr -- 1,139 cr 0 吨
Structural Regulators -- -- 2,338 cr 37 吨
Telemetry Suite 1,618 cr -- 1,617 cr 0 吨
Xihe Biomorphic Companions* 3,587 cr -- 3,586 cr 0 吨

Textiles

Buy price Stock Sell price Demand
Banki Amphibious Leather* 502 cr -- 501 cr 0 吨
Belalans Ray Leather* 707 cr -- 706 cr 0 吨
Chameleon Cloth* 1,333 cr -- 1,332 cr 0 吨
Conductive Fabrics 435 cr 2,452 吨 406 cr 1 吨
Damna Carapaces* 254 cr -- 253 cr 0 吨
Leather 71 cr -- 70 cr 0 吨
Military Grade Fabrics 713 cr 1,546 吨 682 cr 1 吨
Natural Fabrics 227 cr -- 226 cr 0 吨
Rapa Bao Snake Skins* 442 cr -- 441 cr 0 吨
Synthetic Fabrics 153 cr 7,205 吨 129 cr 1 吨
Tiegfries Synth Silk* 660 cr -- 659 cr 0 吨
Vanayequi Ceratomorpha Fur* 494 cr -- 493 cr 0 吨

Waste

Buy price Stock Sell price Demand
Biowaste 83 cr 144 吨 50 cr 1 吨
Chemical Waste 18 cr -- 17 cr 0 吨
Scrap 71 cr -- 70 cr 0 吨

Weapons

Buy price Stock Sell price Demand
Non-Lethal Weapons -- -- 2,036 cr 17 吨
Reactive Armour -- -- 2,283 cr 45 吨