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常常出门观光的小水陪们，您们能够会碰到如许的题目，乘坐飞机的时候俄然有人奉告飞机坐位降舱了 ，那类天上掉降馅饼的工做真正在让人镇静 ，但是降舱只需飞机有，为甚么下铁出有呢?为甚么飞机能够制止费降舱果为海内