1-1ㄹ2ㄷ3ㄴ4ㄱ 3-1x2o3o4o5x 5-3 7-1 9-(1)2(2)A:폐포B:폐포의모세혈관 11-1증가(2)4 13-(1)3(2)감소 15-(1)3.5(2)0.5(3)1.5 17-ㄹ 19-2 21-가ㄱ나ㄴ다ㄷ 23-5
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