单项选择题

以下数据结构中哪一个是非线性结构?()
A.队列
B.栈
C.线性表
D.二叉树

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单项选择题

The stateroom attendants should do some preparation such as folding towels, replenishing enough hotel amenities and so one before cleaning the rooms.

A．对
B．错

Open the window and let the fresh air in.

答案：正确答案：打开窗户让新鲜空气进来。