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【单选题】
下列有关网络拓扑结构的叙述中，正确的是_________。A.
结构的缺点是：当需要增加新的节点时，成本比较高
B.
树形结构的线路复杂，网络管理也较困难
C.
网络的拓扑结构是指网络中节点的物理分布方式
D.
网络的拓扑结构是指网络节点间的布线方式
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【简答题】简述机器语言、汇编语言和高级语言各自的特点。
【单选题】Millions of people all over China _____ TV when the spaceship returned and landed safely. [ ]
A.
are watching
B.
had watched
C.
watch
D.
were watching
【简答题】质量控制是消除（）问题，使产品质量保持规定的水平；而质量改进是消除系统性问题。
【单选题】Each day, computers help millions of people do their jobs more effectively. For example, they can help managers decide on a future course of action, and they can then help with the follow-up checks on...
A.
Helping managers decide on a future course of action.
B.
Helping managers check if planned goals are reached.
C.
Helping managers save time in writing a report.
D.
Helping managers design a spreadsheet package.
【简答题】简述机器语言、汇编语言、高级语言各自的特点。
【单选题】The Great Wall is ________ tourist attraction that millions of people pour in every year. [ ]
A.
so a wellknown
B.
a so wellknown
C.
such wellknown
D.
such a wellknown
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