8. 計算GM所用的公式為:
(A) GM = KB – KM
(B) GM = KB + KM
(C) GM = KM + KG
(D) GM = KM – KG
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統計: A(0), B(0), C(0), D(5), E(0) #419451
統計: A(0), B(0), C(0), D(5), E(0) #419451