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【判断题】
辅助变量是描述决策过程的存量和流量之间信息传递和转换过程中间环节。A.
正确
B.
错误
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举一反三
【简答题】The roads have to be ______ (wide) so that the problems of traffic jam can be solved.
【多选题】下列说法正确的是（）
A.
如果一个连通图有 r个顶点，则其完全关联矩阵的秩为r-1
B.
完全关联矩阵中两个平行边对应的两列相同。
C.
完全关联矩阵一行中的元素全为 0，其对应的顶点为孤立点。
D.
完全关联矩阵每一行元素的和对应于顶点的度数
【简答题】图 的完全关联矩阵为___________________。
【简答题】证明：设图G有n个结点，r个最大连通子图，则图G的完全关联矩阵的秩为n-r．
【单选题】Passage 1Traffic jam and cities, it seems, go hand in hand. Everyone complains about being stuck in traffic; but, like the weather, no one seems to do anything about it. In particular, traffic enginee...
A.
California is as crowded and successful as San Francisco.
B.
The traffic jam in San Francisco has resulted in the capital becoming empty.
C.
The traffic jam level in Jakarta is lower than that in the US.
D.
Traffic jam has caused terrible bad effects in cities such as Bangkok and Lagos.
【单选题】It is reported that China is developing ________ emergency plan to solve ________ traffic jam crisis in Beijing. [ ]
A.
the; the
B.
an; /
C.
an; the
D.
/; the
【单选题】What kind of problem are they having?
A.
A traffic jam.
B.
A paper jam.
C.
A broken LCD display.
D.
They are late for the meeting.
【多选题】下列说法正确的是？
A.
如果一个连通图有r个顶点，则其完全关联矩阵的秩为r-1。
B.
完全关联矩阵每一行元素的和对应于顶点的度数。
C.
完全关联矩阵一行中的元素全为0，其对应的顶点为孤立点。
D.
完全关联矩阵中两个平行边对应的两列相同。
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