在按层次遍历二叉树的算法中,需要借助的辅助数据结构是( )。
A.有序表
B.线性表
C.栈
D.队列
参考答案:D
解析: 在按层次遍历二叉树的算法中,需要借助的辅助数据结构是队列。
The hall ______ for our school Christmas party and everything will soon be ready.
[ ]
A. was decorated
B. was being decorated
C. is being decorated
D. has been decorated
下列关于铸造卡环的叙述正确的是
A.铸造卡环较适合于Ⅲ型观测线
B.铸造卡环固位臂一般需要0.75mm的水平倒凹
C.铸造卡环臂一般设计为I杆
D.铸造卡环较锻丝卡环弹性、韧性好,不易折断
E.铸造卡环与基牙的接触面积较锻丝卡环大