Ch\u01b0\u01a1ng 6: B\u00e0i 34 : B\u00e0i th\u1ef1c h\u00e0nh 4 : \u0110i\u1ec1u ch\u1ebf v\u00e0 t\u00ednh ch\u1ea5t c\u1ee7a etilen v\u00e0 axetilen<\/a><\/blockquote><\/iframe>