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【单选题】
一力学系统由两个质点组成，它们之间只有引力作用。若两质点所受外力的矢量和为零，则此系统A.
动量、机械能以及对一轴的角动量都守恒
B.
动量、机械能守恒，但角动量是否守恒不能断定
C.
动量守恒，但机械能和角动量守恒与否不能断定
D.
动量和角动量守恒，但机械能是否守恒不能断定
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【简答题】The article is a piece of narration. what is the narration line of the story? and what is the narration point of view?
【单选题】What is the typical structure of a good narration?
A.
Introduction --body -- conclusion
B.
Conclusion --introduction -- body
C.
Body --introduction -- conclusion
D.
Conclusion --body -- introduction
【单选题】Why we call software 'soft'?
A.
We call it 'soft' because we can change it and reshape it easily.
B.
We call it 'soft' because it is covered inside.
C.
We call it 'soft' because it is like our brain.
D.
We call it 'soft' because it is invisible.
【单选题】设关系模式R上函数依赖集F=A-＞B，B-＞C，C-＞A，则F的最小函数依赖集F1= ______。
A.
{A-＞B，B-＞C }
B.
{B-＞C，C-＞A}
C.
{ A-＞B，B-＞C，C-＞A}
D.
{A-＞B，C-＞A}
【单选题】What is restricted narration?
A.
It is the narration that withholds all of the story information from the audience.
B.
It is the narration that allows the audience to know more than any-or all-the characters
C.
It is the narration that creates a sense of objectivity for audience.
D.
It is the narration that withholds much of the story information from the audience.
【简答题】In what order is usually a narration arranged? It is usually arranged in .
【单选题】What is NOT abasic element in a narration?
A.
Character and plot
B.
Setting and POV
C.
Conflict and order
D.
Point of view
【简答题】Office2016 剪贴板中最多可以保存 ( ) 个对象 ,能方便的从中选择需要的内容进行粘贴操作 。
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