题目内容

单选题 In a queue, data are inserted only at the()and deleted only at the ().

A. rear; front or rear
B. front; rear
C. rear; front
D. rear or front; front

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单选题 The indegree of () of a tree is always zero.

A. any node
B. a branch
C. the root
D. a leaf

单选题 If an internal node has 4 outdegree branches, its degree is ().

A. 9
B. 1
C. 4
D. 5

单选题 A node of a tree has a degree of 3. This means its outdegree is ().

A. 0
B. 2
C. 4
D. none of the above

单选题 A () is a sequence of nodes in which each node is adjacent to the next one.

A. leaf
B. root
C. descendant
D. path