Question: 长江证券最近一个交易日收盘价
Answer: 必答点：长江证券最新交易日的收盘价
精度要求：仅允许四舍五入误差
Date: 2025/8/14
Reference data: {"000783___SZ":{"RT_TIME":"150000","RT_LAST":"7.8500000000000005","RT_DATE":"20250814"}}