46.飛機結構件鈑金件如翼肋、引擎支撐件等正常可以執行下列何種維修？ (A) repairable, using approved methods. (B) repairable, except when subjected to compressive loads. (C) not repairable, but must be replaced when damaged or deteriorated. (D) not repairable and not replaced when damaged and deteriorated.