6. In the figure on the above, the marginal cost curve is curve 
(A) A.
(B) B.
(C) C.
(D) D.
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統計: 尚無統計資料
統計: 尚無統計資料
6. In the figure on the above, the marginal cost curve is curve 
(A) A.
(B) B.
(C) C.
(D) D.