创建选区时为了使选区更平滑无明显的锯齿，需要在选区工具选项栏中设置（）选项。
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车辆管理所及其工作人员不得泄露机动车驾驶证档案中的个人信息。
A. 正确
B. 错误
水平裂缝会使深、浅侧向电阻率都降低。
A. 正确
B. 错误
Which two statements are true regarding B-tree index（）
A. The leaf blocks in the index are doubly linked.
B. The leaf node stores a bitmap for each key value.
C. The rows with NULL value in key columns also have entries in the index.
D. The deletion of a row from the table causes a logical deletion in index leaf block and the space becomes available for the new leaf entry.
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