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【单选题】
A person pulls a block across a rough horizontal surface at a constant speed by applying a force F.The arrows in the diagram below correctly indicate the directions, but not necessarily the magnitudes of the various forces on the block. Which of the following relations among the force magnitudes W, k, N, and F must be true?
A.
F = k and N = W
B.
F = k and N > W
C.
F > k and N < W
D.
F < k and N=W
E.
None of the above choices
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