沪金、沪银、SC原油主力合约：12月30日收盘涨跌幅各异

Group 1 - The core viewpoint of the article indicates a decline in the prices of gold and silver futures, while crude oil prices have shown a slight increase [1] Group 2 - As of December 30, the main gold futures contract fell by 4.00%, closing at 976 yuan per gram [1] - The main silver futures contract experienced a significant drop of 8.74%, closing at 17,237 yuan per kilogram [1] - In contrast, the SC crude oil main futures contract rose by 0.30%, closing at 437 yuan per barrel [1]