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- 2010년 블로노트 blonote - blobyblo / MapNow Place your thoughts on a sheet of paper. It can become a plane. The death of someone you know makes you backtrack.
- Stable, unstable, indifferent equilibrium motion of a mass, you need only examine that of its centre of gravity. For example, you may know that in spite of gravitational action a body remains at rest, if it is horizontally
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