开盘|国内期货主力合约跌多涨少，沪银跌近20%

Group 1 - The domestic futures market opened with more declines than gains, with notable drops in silver and tin futures, down nearly 20% and over 11% respectively [3][7] - SC crude oil fell over 4%, while fuel oil and platinum dropped more than 3% [3][7] - In contrast, shipping European line, aluminum oxide, and PVC saw increases of over 1% [3][7] Group 2 - The overnight London spot precious metals market showed a slight narrowing of declines but remained weak, with domestic silver and platinum-palladium futures continuing to hit the limit down [5][8] - The gold-silver ratio quickly rebounded to 58.1, and the platinum-palladium price spread narrowed to $404 per ounce [5][8] - The US ISM manufacturing index rose to 52.6, significantly exceeding expectations of 48.5, driven by robust growth in new orders and output [5][8] - The recent volatility in the precious metals market is attributed to a forced liquidation due to extreme overbuying and crowded trades, indicating a potential for a more stable phase for gold [5][8] - Silver continues to exhibit high volatility, with the main silver futures contract experiencing a second limit down, which has absorbed much of the risk [5][8] - Despite significant declines in platinum and palladium, the long-term supply-demand dynamics suggest a potential for buying on dips once gold stabilizes [5][8]