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- 通俗读物 (3)
- 社会心理学 (2)
- 行为经济学 (2)
- afghan war, 2001- (1)
- campaigns (1)
- computer simulation (1)
- cranes, derricks, etc (1)
- design and construction (1)
- dynamics (1)
- evans, duane, (1)
- gravity (1)
- hoisting machinery (1)
- intelligence officers (1)
- mechanics (1)
- pendulum (1)
- rotational motion (rigid dynamics) (1)
- secret service (1)
- special operations (military science) (1)
- taliban (1)
- united states (1)
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