题目内容

3) Professor Waters____________.

A) knows well how to teach English
B) is a new hand in writing books
C) writes books in different fields
D) is very good at speaking English

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4) This speech is a (an) ____________ speech.

A) thank-you
B) opening
C) welcome
D) closing

除二羟基丙酮外，单糖均为还原糖。

A. 对
B. 错

连通无向图G有6个顶点9条边，从G中删去（）条边才有可能得到G的一棵生成树T．

A. 3
B. 4
C. 5
D. 6

无向树G(n,m)的基本边割集数为（）

A. m
B. n-1
C. m-1
D. m-n+1