20. 為一位胃潰瘍出血患者進行胃鏡檢查時，見到下列那些潰瘍病變時，宜施予內視鏡止血治療？(1) gastric ulcer with a spurting visible vessel(2) gastric ulcer with a non-bleeding visible vessle(3) gastric ulcer with a clean base(4) gastric ulcer with flat pigmented spots(5) gastric ulcer with adherent clots(A) (1)＋(2)＋(3)(B) (1)＋(2)＋(5)(C) (1)＋(2)＋(4)(D) (1)＋(5)(E) (1)＋(2)＋(4)＋(5)