Epsilon Eridani [#3657265320658]

Shadows Endurant [#128999105]
类型:
巨型飞船
天体：
Goldstein's Rock (280 光秒)

拥护:
独立
政府:
神权
经济:
服务

设施：
商品
Black Market, Contacts, Crew Lounge, Missions, Refuel, Repair, Restock, Search and Rescue

派系:
Sublime Order of van Maanen's Star
派系状态:
None

禁止：
Narcotics, Battle Weapons, Combat Stabilisers, Consumer Technology, Imperial Slaves, Landmines, Nanomedicines, Personal Weapons, Slaves, Tobacco
最后更新： 24/4/28 下午12:56

Chemicals
Buy price Stock Sell price Demand
Agronomic Treatment -- -- 3,624 cr 6 吨
Anduliga Fire Works* 707 cr -- 706 cr 0 吨
Delta Phoenicis Palms* 331 cr -- 330 cr 0 吨
Explosives 158 cr -- 157 cr 0 吨
HIP Organophosphates* 310 cr -- 309 cr 0 吨
Hydrogen Fuel 84 cr 6,662 吨 80 cr 1 吨
Hydrogen Peroxide 1,157 cr -- 1,156 cr 0 吨
Koro Kung Pellets* 194 cr -- 193 cr 0 吨
Liquid Oxygen 487 cr -- 486 cr 0 吨
Mineral Oil 83 cr -- 82 cr 0 吨
Nerve Agents 9,281 cr -- 9,280 cr 0 吨
Pesticides 105 cr -- 104 cr 0 吨
Rockforth Fertiliser 3 cr -- 2 cr 0 吨
Surface Stabilisers 305 cr -- 304 cr 0 吨
Synthetic Reagents 4,573 cr -- 4,572 cr 0 吨
Tritium 39,599 cr -- 39,597 cr 0 吨
Water -- -- 698 cr 777 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 -- -- 895 cr 2,058 吨
Crystalline Spheres* 4,902 cr -- 4,901 cr 0 吨
Domestic Appliances -- -- 1,141 cr 693 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 167 cr -- 166 cr 0 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 305 cr -- 304 cr 0 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
Albino Quechua Mammoth Meat 2,032 cr -- 2,031 cr 0 吨
Algae 33 cr -- 32 cr 0 吨
Animal Meat -- -- 2,000 cr 528 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 -- -- 1,822 cr 161 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 -- -- 998 cr 1,533 吨
Food Cartridges -- -- 566 cr 161 吨
Fruit and Vegetables -- -- 895 cr 580 吨
Giant Irukama Snails 1,450 cr -- 1,449 cr 0 吨
Goman Yaupon Coffee 1,162 cr -- 1,161 cr 0 吨
Grain -- -- 772 cr 3,433 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
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 -- -- 681 cr 375 吨
Tanmark Tranquil Tea* 1,453 cr -- 1,452 cr 0 吨
Tea -- -- 2,193 cr 486 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 4,011 cr -- 4,010 cr 0 吨
Ceramic Composites 83 cr -- 82 cr 0 吨
Insulating Membrane 7,518 cr -- 7,517 cr 0 吨
Medb Starlube* 334 cr -- 333 cr 0 吨
Meta-Alloys 148,613 cr -- 148,605 cr 0 吨
Micro-weave Cooling Hoses 761 cr -- 760 cr 0 吨
Neofabric Insulation 3,478 cr -- 3,477 cr 0 吨
Polymers 49 cr -- 48 cr 0 吨
Semiconductors 547 cr -- 546 cr 0 吨
Superconductors 4,573 cr -- 4,572 cr 0 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 -- -- 738 cr 2,538 吨
Bootleg Liquor 49 cr -- 48 cr 0 吨
Burnham Bile Distillate* 646 cr -- 645 cr 0 吨
Centauri Mega Gin* 2,633 cr -- 2,632 cr 0 吨
Chateau De Aegaeon* 1,015 cr -- 1,014 cr 0 吨
Eranin Pearl Whisky 1,298 cr -- 1,297 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
Leestian Evil Juice* 367 cr -- 366 cr 0 吨
Liquor -- -- 1,096 cr 171 吨
Lucan Onionhead 654 cr -- 653 cr 0 吨
Onionhead Gamma Strain -- -- 5,712 cr 412 吨
Saxon Wine* 1,234 cr -- 1,233 cr 0 吨
Tarach Spice 846 cr -- 845 cr 0 吨
Thrutis Cream* 742 cr -- 741 cr 0 吨
Wine -- -- 823 cr 1,189 吨
Wuthielo Ku Froth 338 cr -- 337 cr 0 吨

Machinery
Buy price Stock Sell price Demand
Articulation Motors 4,573 cr -- 4,572 cr 0 吨
Atmospheric Processors 226 cr -- 225 cr 0 吨
Building Fabricators 1,406 cr -- 1,405 cr 0 吨
Crop Harvesters 1,406 cr -- 1,405 cr 0 吨
Emergency Power Cells 1,406 cr -- 1,405 cr 0 吨
Energy Grid Assembly 1,614 cr -- 1,613 cr 0 吨
Exhaust Manifold 1,070 cr -- 1,069 cr 0 吨
Geological Equipment 1,137 cr -- 1,136 cr 0 吨
Giant Verrix* 5,219 cr -- 5,218 cr 0 吨
HN Shock Mount 1,137 cr -- 1,136 cr 0 吨
Heatsink Interlink 1,226 cr -- 1,225 cr 0 吨
Magnetic Emitter Coil 708 cr -- 707 cr 0 吨
Marine Equipment 2,828 cr -- 2,827 cr 0 吨
Microbial Furnaces 88 cr -- 87 cr 0 吨
Mineral Extractors 348 cr -- 347 cr 0 吨
Modular Terminals 1,137 cr -- 1,136 cr 0 吨
Non Euclidian Exotanks* 715 cr -- 714 cr 0 吨
Power Converter 761 cr -- 760 cr 0 吨
Power Generators -- -- 2,898 cr 283 吨
Power Transfer Bus 1,321 cr -- 1,320 cr 0 吨
Radiation Baffle 993 cr -- 992 cr 0 吨
Reinforced Mounting Plate 1,515 cr -- 1,514 cr 0 吨
Skimmer Components 578 cr -- 577 cr 0 吨
Thermal Cooling Units 2,456 cr -- 2,455 cr 0 吨
Volkhab Bee Drones 2,611 cr -- 2,610 cr 0 吨
Water Purifiers -- -- 879 cr 870 吨
Wulpa Hyperbore Systems* 942 cr -- 941 cr 0 吨

Medicines
Buy price Stock Sell price Demand
Advanced Medicines -- -- 1,832 cr 630 吨
Agri-Medicines 621 cr -- 620 cr 0 吨
Alya Body Soap* 365 cr -- 364 cr 0 吨
Basic Medicines -- -- 751 cr 254 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
Pantaa Prayer Sticks* 1,454 cr -- 1,453 cr 0 吨
Performance Enhancers 4,573 cr -- 4,572 cr 0 吨
Progenitor Cells -- -- 7,408 cr 144 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 177 cr -- 176 cr 0 吨
Beryllium 5,704 cr -- 5,703 cr 0 吨
Bismuth 1,515 cr -- 1,514 cr 0 吨
Cobalt 2,085 cr -- 2,084 cr 0 吨
Copper 268 cr -- 267 cr 0 吨
Gallium 3,478 cr -- 3,477 cr 0 吨
Gold -- -- 51,049 cr 941 吨
Indium 4,011 cr -- 4,010 cr 0 吨
Lanthanum 6,093 cr -- 6,092 cr 0 吨
Lithium 993 cr -- 992 cr 0 吨
Osmium 14,766 cr -- 14,765 cr 0 吨
Palladium -- -- 53,979 cr 753 吨
Platinum -- -- 59,972 cr 588 吨
Platinum Alloy 11,842 cr -- 11,841 cr 0 吨
Praseodymium 5,278 cr -- 5,277 cr 0 吨
Samarium 17,122 cr -- 17,121 cr 0 吨
Silver -- -- 41,005 cr 8,183 吨
Sothis Crystalline Gold* 12,726 cr -- 12,725 cr 0 吨
Tantalum 2,619 cr -- 2,618 cr 0 吨
Thallium 2,456 cr -- 2,455 cr 0 吨
Thorium 8,034 cr -- 8,033 cr 0 吨
Titanium 621 cr -- 620 cr 0 吨
Uranium 1,741 cr -- 1,740 cr 0 吨

Minerals
Buy price Stock Sell price Demand
Alexandrite 88,703 cr -- 88,698 cr 0 吨
Bauxite 578 cr -- 577 cr 0 吨
Benitoite 47,757 cr -- 47,754 cr 0 吨
Bertrandite 13,011 cr -- 13,010 cr 0 吨
Bromellite 19,237 cr -- 19,236 cr 0 吨
Cherbones Blood Crystals* 10,005 cr -- 10,004 cr 0 吨
Coltan 3,874 cr -- 3,873 cr 0 吨
Cryolite 7,788 cr -- 7,787 cr 0 吨
Gallite 8,162 cr -- 8,161 cr 0 吨
Goslarite 3,360 cr -- 3,359 cr 0 吨
Grandidierite 69,526 cr -- 69,522 cr 0 吨
Indite 7,677 cr -- 7,676 cr 0 吨
Jadeite -- -- 42,262 cr 588 吨
Lepidolite 348 cr -- 347 cr 0 吨
Lithium Hydroxide 3,259 cr -- 3,258 cr 0 吨
Low Temperature Diamonds 34,307 cr -- 34,305 cr 0 吨
Methane Clathrate 438 cr -- 437 cr 0 吨
Methanol Monohydrate Crystals 1,137 cr -- 1,136 cr 0 吨
Moissanite -- -- 24,705 cr 1,200 吨
Monazite 104,574 cr -- 104,568 cr 0 吨
Musgravite 72,558 cr -- 72,554 cr 0 吨
Ngadandari Fire Opals* 12,726 cr -- 12,725 cr 0 吨
Painite 18,006 cr -- 18,005 cr 0 吨
Pyrophyllite 7,093 cr -- 7,092 cr 0 吨
Rhodplumsite 91,331 cr -- 91,326 cr 0 吨
Rutile 1,226 cr -- 1,225 cr 0 吨
Serendibite 60,047 cr -- 60,043 cr 0 吨
Taaffeite -- -- 51,958 cr 588 吨
Uraninite 1,703 cr -- 1,702 cr 0 吨
Void Opals 37,898 cr -- 37,896 cr 0 吨

Salvage
Buy price Stock Sell price Demand
Ancient Casket 6,503 cr -- 6,502 cr 0 吨
Ancient Key 11,666 cr -- 11,665 cr 0 吨
Ancient Orb 6,955 cr -- 6,954 cr 0 吨
Ancient Relic 10,547 cr -- 10,546 cr 0 吨
Ancient Tablet 6,955 cr -- 6,954 cr 0 吨
Ancient Totem 8,517 cr -- 8,516 cr 0 吨
Ancient Urn 4,882 cr -- 4,881 cr 0 吨
Antique Jewellery 138,914 cr -- 138,907 cr 0 吨
Assault Plans 13,535 cr -- 13,534 cr 0 吨
Caustic Tissue Sample 51,133 cr -- 51,130 cr 0 吨
Commercial Samples 708 cr -- 707 cr 0 吨
Coral Sap 97,557 cr -- 97,552 cr 0 吨
Data Core 4,011 cr -- 4,010 cr 0 吨
Diplomatic Bag 17,372 cr -- 17,371 cr 0 吨
Earth Relics 9,920 cr -- 9,919 cr 0 吨
Encrypted Correspondence 4,071 cr -- 4,070 cr 0 吨
Encrypted Data Storage 4,186 cr -- 4,185 cr 0 吨
Fossil Remnants 7,518 cr -- 7,517 cr 0 吨
Galactic Travel Guide 359 cr -- 358 cr 0 吨
Gene Bank 39,407 cr -- 39,405 cr 0 吨
Geological Samples 4,186 cr -- 4,185 cr 0 吨
Large Survey Data Cache 196,687 cr -- 196,677 cr 0 吨
Mollusc Brain Tissue 22,880 cr -- 22,878 cr 0 吨
Mollusc Fluid 3,478 cr -- 3,477 cr 0 吨
Mollusc Membrane 12,253 cr -- 12,252 cr 0 吨
Mollusc Mycelium 22,880 cr -- 22,878 cr 0 吨
Mollusc Soft Tissue 11,462 cr -- 11,461 cr 0 吨
Mollusc Spores 3,478 cr -- 3,477 cr 0 吨
Mysterious Idol 14,004 cr -- 14,003 cr 0 吨
Pod Core Tissue 2,619 cr -- 2,618 cr 0 吨
Pod Dead Tissue 8,586 cr -- 8,585 cr 0 吨
Pod Mesoglea 18,710 cr -- 18,709 cr 0 吨
Pod Outer Tissue 4,283 cr -- 4,282 cr 0 吨
Pod Shell Tissue 37,413 cr -- 37,411 cr 0 吨
Pod Surface Tissue 20,008 cr -- 20,006 cr 0 吨
Pod Tissue 8,034 cr -- 8,033 cr 0 吨
Precious Gems 121,378 cr -- 121,371 cr 0 吨
Protective Membrane Scrap 22,880 cr -- 22,878 cr 0 吨
Rare Artwork -- -- 16,684 cr 30 吨
SAP 8 Core Container 49,491 cr -- 49,488 cr 0 吨
Scientific Research 9,240 cr -- 9,239 cr 0 吨
Scientific Samples 3,763 cr -- 3,762 cr 0 吨
Small Survey Data Cache 16,485 cr -- 16,484 cr 0 吨
Space Pioneer Relics 6,093 cr -- 6,092 cr 0 吨
Tactical Data 8,880 cr -- 8,879 cr 0 吨
Thargoid Basilisk Tissue Sample 52,938 cr -- 52,935 cr 0 吨
Thargoid Biological Matter 37,413 cr -- 37,411 cr 0 吨
Thargoid Cyclops Tissue Sample 45,782 cr -- 45,779 cr 0 吨
Thargoid Glaive Tissue Sample -- -- 71,517 cr 60 吨
Thargoid Heart 104,964 cr -- 104,958 cr 0 吨
Thargoid Hydra Tissue Sample 80,149 cr -- 80,144 cr 0 吨
Thargoid Link 37,413 cr -- 37,411 cr 0 吨
Thargoid Medusa Tissue Sample 60,572 cr -- 60,568 cr 0 吨
Thargoid Orthrus Tissue Sample 74,378 cr -- 74,374 cr 0 吨
Thargoid Probe 345,795 cr -- 345,777 cr 0 吨
Thargoid Resin 22,880 cr -- 22,878 cr 0 吨
Thargoid Scout Tissue Sample 16,187 cr -- 16,186 cr 0 吨
Thargoid Scythe Tissue Sample 52,938 cr -- 52,935 cr 0 吨
Thargoid Sensor 235,613 cr -- 235,601 cr 0 吨
Thargoid Technology Samples 28,288 cr -- 28,286 cr 0 吨
Time Capsule 3,018 cr -- 3,017 cr 0 吨
Titan Deep Tissue Sample -- -- 498,098 cr 60 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 -- -- 139,291 cr 60 吨
Titan Tissue Sample -- -- 272,136 cr 60 吨
Titan drive component* 276,883 cr -- 276,869 cr 0 吨
Unclassified Relic 4,551 cr -- 4,550 cr 0 吨
Unoccupied Escape Pod -- -- 4,065 cr 60 吨
Unstable Data Core 2,456 cr -- 2,455 cr 0 吨

Slavery
Buy price Stock Sell price Demand
Master Chefs* 14,402 cr -- 14,401 cr 0 吨

Technology
Buy price Stock Sell price Demand
AZ Cancri Formula 42* 5,155 cr -- 5,154 cr 0 吨
Advanced Catalysers 1,855 cr -- 1,854 cr 0 吨
Animal Monitors 158 cr -- 157 cr 0 吨
Aquaponic Systems 141 cr -- 140 cr 0 吨
Auto-Fabricators 2,456 cr -- 2,455 cr 0 吨
Bioreducing Lichen 578 cr -- 577 cr 0 吨
Classified Experimental Equipment 4,002 cr -- 4,001 cr 0 吨
Computer Components 305 cr -- 304 cr 0 吨
H.E. Suits 141 cr -- 140 cr 0 吨
Hardware Diagnostic Sensor 4,573 cr -- 4,572 cr 0 吨
Ion Distributor 1,406 cr -- 1,405 cr 0 吨
Land Enrichment Systems 3,259 cr -- 3,258 cr 0 吨
Medical Diagnostic Equipment -- -- 3,639 cr 1,224 吨
Micro Controllers 3,713 cr -- 3,712 cr 0 吨
Muon Imager 4,283 cr -- 4,282 cr 0 吨
Nanobreakers 1,070 cr -- 1,069 cr 0 吨
Resonating Separators 4,011 cr -- 4,010 cr 0 吨
Robotics 1,137 cr -- 1,136 cr 0 吨
Structural Regulators 1,137 cr -- 1,136 cr 0 吨
Telemetry Suite 1,614 cr -- 1,613 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 268 cr -- 267 cr 0 吨
Damna Carapaces* 254 cr -- 253 cr 0 吨
Leather 70 cr -- 69 cr 0 吨
Military Grade Fabrics 475 cr -- 474 cr 0 吨
Natural Fabrics 226 cr -- 225 cr 0 吨
Rapa Bao Snake Skins* 442 cr -- 441 cr 0 吨
Synthetic Fabrics 77 cr -- 76 cr 0 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 68 cr 465 吨 41 cr 1 吨
Chemical Waste 18 cr -- 17 cr 0 吨
Scrap 70 cr -- 69 cr 0 吨

Weapons
Buy price Stock Sell price Demand
Non-Lethal Weapons -- -- 2,341 cr 105 吨
Reactive Armour -- -- 2,601 cr 175 吨