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战前计划长山列岛位于辽东半岛与山东半岛之间的渤海海峡中,地处海上交通要道,系华北咽喉、京津屏障和胶辽联结枢纽,历来是海疆要塞、兵家必争之地。列岛由南北长山
Pre-war plans Changshan Islands is located in the Bohai Strait between Liaodong Peninsula and Shandong Peninsula, and is located at the sea traffic thoroughfare, which is the junction of North China Throat, Beijing-Tianjin Barrier and Jiaoliao. Islands from north to south mountains