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质点系动能Ek可分解为质心动能Ekc与质点系相对质心动能E'k之和，试据此导出刚体平行轴定理。
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【单选题】质点系的动量定理，说的是___The Momentum Theorem for Particle Systems says___
A.
质点系合外力的冲量，等于质点系动量的增量； The Momentum of Particle System is equal to the momentum increment of particle system;
B.
质点系合外力的冲量，等于质点系动能的增量； The Impulse of particle system is equal to the increment of Kinetic Energy of particle system;
C.
质点系合外力的冲量，等于质点系势能的增量； The Impulse of the particle system is equal to the increment of the Potential Energy of the particle system;
D.
质点系合外力的冲量，等于质点系机械能的增量； The Impulse of particle system combined with external force is equal to the increment of Mechanical Energy of particle system;
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【单选题】质点系的动量定理，说的是___The Momentum Theorem for Particle Systems says___
A.
质点系合外力的冲量，等于质点系动量的增量； The Momentum of Particle System is equal to the momentum increment of particle system;
B.
质点系合外力的冲量，等于质点系动能的增量； The Impulse of particle system is equal to the increment of Kinetic Energy of particle system;
C.
质点系合外力的冲量，等于质点系势能的增量； The Impulse of the particle system is equal to the increment of the Potential Energy of the particle system;
D.
质点系合外力的冲量，等于质点系机械能的增量； The Impulse of particle system combined with external force is equal to the increment of Mechanical Energy of particle system;
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