A股中字头午后走强，中铝国际拉升涨停，中船应急冲高近5%，中国船舶、久之洋等中船系个股表现活跃。

Group 1 - The A-share market saw a strong performance in the afternoon, particularly among companies with "China" in their names [1] - Chalco International (中铝国际) surged to a trading limit, indicating significant investor interest [1] - China Shipbuilding Emergency Response (中船应急) experienced a nearly 5% increase, reflecting positive market sentiment [1] Group 2 - Other companies in the China Shipbuilding sector, such as China Shipbuilding (中国船舶) and Jiuzhiyang (久之洋), also showed active trading performance [1]