89. 急性胃炎造成的糜爛(erosion) 係指病理變化通常不超過胃部的那一層 (A)表面淺層上皮(Superficial epithelium) (B)黏膜肌層(Muscularis mucosae) (C)黏膜下層(Submucosae) (D)肌肉層(Muscle layer)