(多选题)28: 以下序列中,是堆( )的有( )。
A: {15,26,38,49,27,51,39,62}
B: {15,23,71,94,72,68,26,73}
C: {15,27,26,49,38,62,39,51}
D: {15,23,26,68,94,72,71,73}
E: {94,72,73,26,71,23,68,15}
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