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【简答题】
一个质量为m的质点在OXY平面上运动，其位置矢量为r=acosωti+bsinωtj（SI），式中a、b和ω是正值常量，且a＞b。（1）求质点在点C（a，0）点D（0，b）时的动能；（2）求质点所受的合外力F以及当质点从点C运动到点D的过程中F的分力Fx和Fy分别做的功。
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【简答题】What does the reduction in leucocyte levels in the body mean?
【单选题】According to the professor, what is NOT included in the four levels on which a translator works?
A.
Finding certain field of knowledge and learning it.
B.
Using appropriate language and usage to describe facts.
C.
A creative process which distinguishes good and bad writing.
D.
Expressing preferences and showing individual differences.
【单选题】What does the reduction in leukocyte levels in the body mean?
A.
It may mean the reduced levels of inflammation.
B.
It may mean somewhere in the body in inflamed.
C.
It means that the body is challenged.
D.
It means that the body cannot produce leucocytes any more.
【单选题】What A-levels is the student taking?
A.
He doesn't say.
B.
He hasn't started his A-levels yet.
C.
Politics, a language and another subject.
D.
Economics, geography and history.
【单选题】What does the reduction in leucocyte levels in the body mean?
A.
It may mean the reduced levels of inflammation.
B.
It may mean somewhere in the body is inflamed.
C.
It means that the body is challenged.
D.
It means that the body cannot produce leucocytes any more.
【单选题】What determines the difference in energy between two energy levels? ( )
A.
distance from the nucleus
B.
number of electrons in the energy levels
C.
number of valence electrons
D.
distance between the two energy levels
【简答题】What are the two methods used to motivate salespersons at wholesale levels?
【简答题】What are the characteristics of the four levels of the ETL support model? 简述ETL技术支持工作的四个级别的特点。
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