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是正交矩阵？
正确
错误

【参考答案】

错误

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An object with a weight of P=100N is placed on a horizontal surface, as shown in the figure, the friction factor in between is fs=0.2, and the object is stationary under the action of horizontal force F=10N, the friction force is ________. A、20N B、10N C、2N D、-10N

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