The method for inserting elements in a full binary heap is在完全二叉堆中插入元素的方法是 A: Insert into the bottom, percolateUp插入到底层，上滤 B: Insert into the root, percolateDown插入到根节点，下滤 C: Insert into the bottom directly直接插入到底层 D: Insert into the root directly直接插入到根节点