热力激励法是把生产井周围有限区域加热以降低原油粘度．并通过清除粘士及沥青沉淀物来提高井底附近地带的渗透率。
参考答案：对
She said she _______ the new coat for only a week.[ ]
A. has bought
B. had bought
C. has had
D. had had
一棵树按照左子女-右兄弟表示法转换成对应的二叉树，则该二叉树中树根结点肯定没有 【5】 子女。
