题型描述: 多选题
下列序列中，＿＿＿＿＿＿＿＿是堆。
A.{15,52,22,93,30,71}
B.{15,22,30,52,71,93}
C.{15,52,22,71,30,93}
D.{15,30,22,93,52,71}