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【多选题】
关于图论中图的概念，以下叙述正确的是（ ）。A.
图中的边可以是有，也可以是无
B.
图中的各边上可以标注权
C.
结点数等于的连通图中必含圈
D.
结点数等于的图必联通
E.
图中的边只能是有向边
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【单选题】若当前系统是在level 3环境下运行,现在要在不重启系统情况下,转换到level 5环境下运行,怎样实现?
A.
Set level = 5
B.
init 5
C.
run 5
D.
ALT-F7-5
【简答题】Lae表示什么？通常叫做什么？
【简答题】( )是我国著名核物理学家,长期领导并参加核武器的理论研究和设计,填补了我国原子核理论的空白,为氢弹突破作出卓越贡献。
【单选题】Q6.What do we know about the earthquake from the news report?
A.
The US Geological Survey first reported the earthquake.
B.
India’s Meteorological Department has predicted the earthquake.
C.
A newly-built building collapsed in the earthquake.
D.
Three thousand people were reported dead in the earthquake.
【单选题】听力原文：M: You know．every time I see you reviewing the notes I will wonder whether I'm behind．Are we really on Unit 6 already? W: What do you mean? I have to stay ahead. I work in the evenings. Q: What d...
A.
She thinks she is behind in her study.
B.
She only has time to study in the evenings.
C.
She has no time to study in the evenings.
D.
She thinks work is easier than study.
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