【名词&注释】
急性阑尾炎(acute appendicitis)、临床表现(clinical manifestation)、急性肠梗阻(acute intestinal obstruction)、血细胞(blood cells)、急性胃肠炎(acute gastroenteritis)、急性腹膜炎(acute peritonitis)、性胆囊炎
[单选题]During bunkering, the request for stoppage of pumping shall be made, as a rule, 5 minutes ______.
A. ago
B. before
C. ahead
D. front