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理,ABACD,BBCDD,CACBB,DDACB,DDABA,DBCDC
文,最后十题改为ADABA BDBCC
31.(2)H2;+8(画圆包围+8)26数字上下画一撇往左拐 (3)Na ;Ar 32.(1)1,5,2,1 (2)羧基；加成；c
34、碳酸钠,2铁粉,2C,3吸水
理,ABACD,BBCDD,CACBB,DDACB,DDABA,DBCDC
文,最后十题改为ADABA BDBCC
31.(2)H2;+8(画圆包围+8)26数字上下画一撇往左拐 (3)Na ;Ar 32.(1)1,5,2,1 (2)羧基；加成；c
34、碳酸钠,2铁粉,2C,3吸水